NC-2009 IEQc6.2: Controllability of Systems—Thermal Comfort

  • NC CS Schools EQc6.2 Thermal Comfort Diagram
  • What you need

    All multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. (like classrooms or auditoriums) must have at least one occupant comfort control. Multifamily housing must also have one control per unit.

    For individual spaces or open-plan offices, at least 50% of occupants must be able to control their individual comfort conditions.

    A lot of options

    Providing thermal comfort control with operable windows is a common way to earn this credit.Providing thermal comfort control with operable windows is a common way to earn this credit.The credit defines comfort according to the four primary comfort criteriaComfort criteria are specific design conditions that take into account temperature, humidity, air speed, outdoor temperature, outdoor humidity, seasonal clothing, and expected activity. (ASHRAE 55–2004) identified by ASHRAE 55-2004:

    • air temperature
    • radiant temperature
    • humidity
    • air speed.

    A comfort control meeting the credit requirements needs to only address one of these four. Common ways to meet the credit include installing:

    • heating radiators or radiant panels with individual temperature controls;
    • operable windows;
    • or adjustable local air diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light..

    Are desk fans allowed?

    Is a desk fan an acceptable strategy? Some project teams have reported success with desk fans, but it may depend on your rating system.

    LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. #1722, 3/22/2007 which applies to NC-v2.2, but not officially to LEED 2009, states that they are not allowed, since the intent of the credit "deals with providing thermal comfort control as an integral part of the building design."

    However, Reference Guide Addendum ID# 100000766, 2/2/2011, explicitly applies to LEED-2009 rating systems, and states that "Individual comfort plug-in devices are acceptable for meeting the intent of this credit" as long as they are included in your EAp2 energy model.

    Choosing your ventilation system

    You can meet this credit with either naturally or mechanically ventilated buildings.

    Projects using natural ventilation need to provide access to operable windows for at least 50% of occupants. Access to an operable window means that an occupant's desk is located within 20 feet of a window to the inside, and ten feet from side to side.

    Thermal comfort controls like thermostats are a common way to earn this credit, but make sure you choose a mechanical system that allows for that level of variability.Thermal comfort controls like thermostats are a common way to earn this credit, but make sure you choose a mechanical system that allows for that level of variability.It is more difficult to achieve credit compliance with mechanical systems like forced air because the controls typically serve a large area. You can provide a greater level of thermal comfort with underfloor air distribution that provide easily controlled diffusers. 

    For constant-air-volume systems that do not allow individual control, you may need to add an additional unit, such as a reheating coil at the diffuser or perimeter baseboard heating, to achieve the credit’s intent. 

    Heating or cooling

    For mechanically ventilated spaces, previous LEED-certified projects have complied with the credit by providing occupant controls for heating or cooling only. For example, a building providing controls that adjust heat within a certain temperature range can comply with the credit, even if controls are not provided for the cooling season. 

    Air diffusers provided via underfloor air distribution systems can provide individual comfort control in offices.Air diffusers provided via underfloor air distribution systems can provide individual comfort control in offices.

    Approaching the credit by building type

    Multifamily: For a small unit, you may only need a single control—it can be a window or a thermostat. Most units will require a control in each bedroom and in the living room or other multi-occupant spaces.

    Offices: Private offices and open space offices need multiple controls for 50% of occupants. One control in each conference or meeting room.

  • About the IEQ space matrix

    The IEQ space matrix is a key reference document for this credit (as well as several other LEED credits). Currently in its third edition as of 4/1/2013, the matrix is a spreadsheet that categorizes the spaces from the IES Lighting Handbook, 10th Edition for applicability to IEQ credits. These lists are intended to be used along with key LEED definitions for spaces such as regularly occupied spacesRegularly occupied spaces are areas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building.. Many questions about this credit can be clarified by reviewing the IEQ space matrix.

    FAQs for IEQc6.2

    In some areas, individual fan coil units can be adjusted through the BMS, which can be accomplished by the occupant phoning the building manager. As each unit can be controlled, is this sufficient for occupant controllability? A benefit is that the BMS can reset the system at the end of a day and enable the whole system to be balanced.

    It's a good idea but the implementation may not work as well as original conceived. For instance, what if the building manager isn't always readily available? Does everyone have access to his or her number? How many adjustments are possible within your open plan office area? Would there be enough distinct settings to account for controls for roughly half of the occupants in this space?

    LEEDuser is aware of one project earning the credit by providing a very detailed narrative. Clearly visible postings were made in the building that helped to clearly communicate the process to the occupants and a phone number was provided for the occupants so that they would have quick access to the manager.

    Until a LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. clarifies this issue, it is likely to depend on specific circumstances. The strategy makes sense from an energy efficiency standpoint, but the intent of this credit is more about individual occupants having comfort controls.

    Do I have to include all individual and multi-occupant spaces and do they have to be consistent across IEQc6.1 and IEQc6.2?

    In short, yes. If IEQc6.1 and IEQc6.2 are both pursued then all individual and multi-occupant spaces must be included. LEED reviewers will want to see consistency across these for IEQc6.1 and IEQc6.2.

    I’m working on a project that has transient occupants. How does the IEQ space matrix address transients, and are transients required to have access to the controls?

    The matrix includes several space types that have transient occupants, for example: libraries, auditoriums, and transportation terminals. Controls must be provided for these spaces if they are listed as individual occupant or multi occupant and have the corresponding "Yes" in the relevant credit column.

    This question is addressed in more detail under IEQc6.1.

    The categories given in the IEQ space matrix don’t really fit how some of the rooms in my project will be used. What should I do?

    Use your best judgment. The matrix states, “exceptions to area use classifications will be accepted on a case-by-case basis for spaces with atypical uses or those in which strategies required for compliance may compromise the function of the space. This is not an exhaustive list.  If a space is not listed, project teams should try to find a similar space type and follow that guidance.”

    Safety and code compliance have to always come first. You can always try writing a strong narrative to make your case for your project’s exception. However, it’s important to keep in mind that some project types may simply not be well aligned with the credit’s requirements. In that case, it might best to focus your efforts on other LEED credits that are more applicable.

Legend

  • Best Practices
  • Gotcha
  • Action Steps
  • Cost Tip

Pre-Design

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  • Early during pre-design the owner identifies occupant comfort and control goals in the Owner's Project Requirements for commissioning in EAp1 and EAc3.


  • Assess your climate and your ability to provide occupant-controlled interventions for different comfort criteria. These may include: 

    • operable windows for air speed and temperature
    • air conditioning for temperature and humidity 
    • ceiling fans for air speed
    • desiccant dehumidification 
    • radiators for air temperature
    • air diffusers for air speed.

    Desk fans are not considered an acceptable strategy according to LEED Interpretation #1722, although USGBC has not officailly applied that Interpretation to LEED-2009 rating systems.


  • For commercial buildings, systems like fan coils paired with dedicated outdoor air systems can help provide local control to occupants, while reducing first-cost expenses like duct-work.


  • Operable windowIncluding operable windows in the building can reduce dependence on specific mechanical system designs. Positioning as many occupant spaces near operable windows as possible can make this credit easier to achieve.


  • Some conventional systems typically rely on central control, and multiple controls may be difficult to incorporate. Underfloor air distribution, on the other hand, is designed for flexibility and individual control in a way that naturally supports this credit. 


  • The required comfort control has to address only one of the four primary comfort criteria identified by ASHRAE 55-2004: air temperature, radiant temperature, humidity or air speed. You may address multiple criteria, but aren’t required to do so.


  • The comfort system does not have to be especially expensive or complex. It may simply be, for example, localized air conditioning with occupant controls. 


  • Providing occupant comfort controls can add some costs, but they can also save money and improve occupant comfort and productivity. Occupant comfort controls allow for the mechanical system to respond to conditions specific to different parts of the building, improving overall comfort while saving energy. Typically, a system under central control is sized and calibrated for the least comfortable space. For example, in cooling season overhead air conditioning is provided for the warmest space, while everyone else under the same AHU feels uncomfortably cold. By providing individual controls, everyone can adjust the cooling or air speed to their comfort needs. This control often directly translates to lower energy costs.  


  • Individual thermal comfort plug-in devices are allowed under IEQc6.2, as long as they are included in the design but not the baseline energy model.

Schematic Design

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  • Develop a list and number of all occupied spaces in the building, noting multi-occupant spaces. The number of individual occupant spaces and multi-occupant spaces should be the same between IEQc6.1 and IEQc6.2.


  • A multi-occupant space is space for group interactions, like classrooms, conference rooms, cafeterias, lobbies, warehouse loading areas, theaters, break rooms, commercial kitchens, retail stores, and exhibit spaces that expect large number of people to gather. 


  • Each multi-occupant space should have at least one comfort control that regulates air temperature, radiant temperature, humidity, or air speed in that room. 


  • For individually occupied spaces, identify the total number of workstations anticipated to be in each space per the project FTE count or based on the estimates listed in the Reference Guide Appendix 1. "Workstations" are referred here as places where full-time occupants spend majority of their time.


  • How many people per operable window? If using operable windows, locate as many people as possible close to them. Although strictly speaking it may make sense to count one person as needing one operable window, the experience of the LEEDuser team is that the credit has been approved by counting multiple people sitting close to a window as long as a person is within a 20-foot depth and a 10-foot length from one. The operable portion of the window must also be at least 4% of the size of the floor area of the space accessible to a given window, per ASHRAE 62.1-2007. For example, for a 5-foot-long window plus 10 feet on either side the total qualifying floor area would be 25 (5 + 10 + 10) multiplied by 20, or 500 ft2. At 4% of the floor area, the operable window area must be at least 20 ft2. Refer to the Documentation Toolkit for a diagrammatic representation of the window-area-to-floor-area relationship.


  • How many people per control? Even though the credit calls for individual comfort controls, projects often earn this credit by grouping occupants around a single operable window. Similarly, a single mechanical system control can serve up to two occupants, contributing to the 50% credit threshold.


  • If less than 50% of occupants have access to operable windows, add more operable windows, adjust the layout, or add ducts, baseboards or diffusers with controls to add individual comfort controls. Run calculations again and redesign till 50% of people have access to the controls. 


  • An open office space is individually occupied where each person has an individual desk and defined space. 


  • Individually occupied spaces are defined as the place where an occupant spends most of their time, such as a private office, reception desk, workstations or cubicles in open-plan offices. 


  • A control can be as simple as a switch to turn air conditioning on or off, changing temperature in a small permitted range using a thermostat, or closing a diffuser to reduce air flow. 


  • Providing comfort controls that allow an occupant to turn a system on only when using the space, and turn it off at other times, supports energy efficiency goals. Whether or not it can contributes to demonstrable energy reductions for EAc1: Optimize Energy Performance is another question. Except for operable windows, this would be difficult to demonstrate.  


  • Note the credit requirement is based on number of occupants for individually occupied and number of spaces for multi-occupants. Only half of the total building occupants must have controls in individually occupied spaces. However, each of the multi-occupant spaces must have independent controls. 


  • For example, an open plan office has 100 desks and 10 private offices, for a total of 110 individually occupied spaces. At least 55 of the people occupying those spaces must have access to comfort controls. The same office also has two conference rooms. Both conference rooms need their own controls. 


  • Facilities managers may have reservations about providing controls to users. The range of control can be limited to a certain range, however, and should be programmed to be reset at least at the end of the day with the building’s typical temperature setback. Be sure that occupants will be educated on how to use controls. 


  • One control per residential unit is required in hotels and multifamily buildings. 


  • Additional controls imply higher construction costs, with additional wiring, and maintenance for uninterrupted operations. There are low-cost options, such as baseboard heating radiators and heat pumps that are easy to operate and provide good local comfort. Compare the upfront costs of better controls to the long-term benefits of higher productivity, better test scores or hotel occupancy, plus savings in energy usage.


  • Underfloor air or ceiling-air plenum are common systems for allowing occupant comfort control. In addition, they can: 

    • allow for flexibility in layout and design, and ease of electrical wiring, installation of work stations, and arrangement of work spaces; 
    • realize first-cost savings in reduced duct work, lower floor height and possible an additional floor with more leasable space;
    • and enhance daylighting by creating higher floor-to-ceiling heights.

  • Chilled beams and radiant ceiling panels can provide individual temperature controllability. Given the appropriate climate, internal loads and envelope design chilled beams can be a good fit for this credit, especially if other options like operable windows are limited—for example in laboratory buildings.  


  • In the absence of operable windows, it is difficult to meet the 50% credit requirement unless the mechanical system is designed with zones to provide multiple comfort controls. 


  • Operable windows, although offering some energy and comfort benefits, have some drawbacks. They allow in outside air, which may not be of the highest quality, and also allow in outside noise. The unconditioned air they allow in can affect the operation of mechanical systems. 


  • Operable windows are generally higher in cost than fixed windows.


  • A mechanical system with more individual controls may cost more than a conventional system. This cost can be offset, though, by lower operating costs, a more flexible layout, and improved occupant productivity. 

Design Development

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  • If using a mechanical system, confirm that the project design is progressing with a system that allows for multiple controls.


  • Update the count of total individual workstations and those with controls. If the controls do not add to be 50% of total workstations then investigate the potential to add more controls or change the layout to make them more accessible to windows. 


  • Configure the mechanical system so that when windows are open, cooling is turned off to avoid wasting energy. You can accomplish this by hooking operable windows up to wireless sensors that communicate with the cooling system. 


  • Install a building management system that communicates with occupants to open operable windows when outside temperature and humidity are within comfort range as defined by ASHRAE 55-2004. 

Construction Documents

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  • If using operable windows, make sure the window schedule and all construction drawings include relevant details. Specify windows and window locations that make them easy to operate. 


  • Include all control locations and specifications in drawings and bid documents. Verify that the construction budget accounts for all thermostats, diffusers and a feedback system. 


  • Provide for the commissioning of control and response systems in the commissioning scope for EAp1


  • During the construction bidding phase, discuss the schedule to make sure correct control equipment is purchased and installed on time. The controls are only as good as the feedback and response system they are connected to. Explain the control sequence to the subcontractors to minimize confusion. 


  • If value engineering threatens comfort controls, remember their benefits—including energy savings and higher productivity.

Construction

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  • Ensure correct installation of all mechanical systems. 


  • Complete LEED Online documentation. Include mechanical system layout with controls schedule and cut sheets. 


  • List all spaces and occupancy types for the project on LEED Online. Mark the kind and number of controls available in each of those spaces. Select “None” if any of those occupants do not have individual controls. The online submittal form will automatically advise on number of required occupants with controls and those that are available. 


  • The commissioning agent should check and verify operation and setpoints of the controls. (See EAp1.)

Operations & Maintenance

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  • Educate occupants about the range of control adjustments available. Many air diffusers can open or close the air vent and change the temperature only within a limited range, typically within 5ºF–10ºF of acceptable comfort levels. For example, a heating system may allow a range from 68ºF–74ºF. Comfort controls may not allow larger changes or switching to air conditioning during the heating season, and it is helpful for occupants to understand this. Encourage occupants not to leave windows open when heating or cooling is on.


  • Train operations and maintenance staff to troubleshoot any problems, particularly if there is a BMS system that responds to user controls, with overrides for end-of-day setbacks.


  • Incorporate controls into the operations manual and training so that facility staff are aware of the controls mechanism and response system. 

  • USGBC

    Excerpted from LEED 2009 for New Construction and Major Renovations

    IEQ Credit 6.2: Controllability of systems - thermal comfort

    1 Point

    Intent

    To provide a high level of thermal comfort system control1 by individual occupants or groups in multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. (e.g., classrooms or conference areas) and promote their productivity, comfort and well-being.

    Requirements

    Provide individual comfort controls for 50% (minimum) of the building occupants to enable adjustments to meet individual needs and preferences. Operable windows may be used in lieu of controls for occupants located 20 feet inside and 10 feet to either side of the operable part of a window. The areas of operable window must meet the requirements of ASHRAE Standard 62.1-2007 paragraph 5.1 Natural Ventilation (with errata but without addenda2).

    Conditions for thermal comfort are described in IEQ credit 7.1: Thermal Comfort—Design and include the primary factors of air temperature, radiant temperature, air speed and humidity.

    Provide comfort system controls for all shared multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. to enable adjustments that meet group needs and preferences.

    Potential Technologies & Strategies

    Design the building and systems with comfort controls to allow adjustments to suit individual needs or those of groups in shared spaces. ASHRAE Standard 55-2004 (with errata but without addenda2) identifies the factors of thermal comfort and a process for developing comfort criteriaComfort criteria are specific design conditions that take into account temperature, humidity, air speed, outdoor temperature, outdoor humidity, seasonal clothing, and expected activity. (ASHRAE 55–2004) for building spaces that suit the needs of the occupants involved in their daily activities. Control strategies can be developed to expand on the comfort criteria and enable individuals to make adjustments to suit their needs and preferences. These strategies may involve system designs incorporating operable windows, hybrid systems integrating operable windows and mechanical systems, or mechanical systems alone. Individual adjustments may involve individual thermostat controls; local diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light. at floor, desk or overhead levels, control of individual radiant panels, or other means integrated into the overall building, thermal comfort systems and energy systems design. Designers should evaluate the closely tied interactions between thermal comfort, as required by ASHRAE Standard 55-2004 (with errata but without addenda2), and acceptable indoor air quality as required by ASHRAE Standard 62.1-2007 (with errata but without addenda2), whether natural or mechanical ventilation.

    FOOTNOTES
    1.  For the purposes of this credit, comfort system control is defined as control over at least 1 of the following primary factors in the occupant’s
    vicinity: air temperature, radiant temperature, air speed and humidity.

    2.  Project teams wishing to use ASHRAE approved addenda for the purposes of this credit may do so at their discretion. Addenda must be applied
    consistently across all LEED credits.

Technical Guides

IEQ Space Matrix - 2nd Edition

This updated version of the spreadsheet categories dozens of specific space types according to how they should be applied under various IEQ credits. This document is essential if you have questions about how various unique space types should be treated. Up to date, 2nd Edition.


IEQ Space Matrix - 1st Ed.

This spreadsheet categories dozens of specific space types according to how they should be applied under various IEQ credits. This document is essential if you have questions about how various unique space types should be treated.  This is the 1st edition.

Organizations

ASHRAE 55-2004

This ASHRAE standard defines the criteria for human comfort that is followed to design mechanical systems.


ASHRAE 62.1 2007

This ASHRAE standard stipulates minimum outdoor air requirement and minimum window opening for naturally ventilated space. This formula is referenced in this credit where windows are used as control mechanism. 

Publications

National Review of Green Schools: Costs, Benefits, and Implications for Massachusetts

This seminal report documents the financial costs and benefits of green schools compared to conventional schools, specifically with reference to Massachusetts. Page six describes the benefits of ventilation controls on occupant productivity.


Operable Windows and HVAC Systems

Taylor Engineering lays out design guidance for integrating operable windows into an HVAC system, while also reducing energy consumption.


Integrated Design and UFAD

In this article from ASHRAE Journal, the authors outline the benefits of an integrated designAn integrated design process (also called "integrative" design by some proponents) relies on a multidisciplinary and collaborative team approach in which members make decisions together based on a shared vision and holistic understanding of the project. Rather than a conventional linear design process in which a design is passed from one professional to another, an integrated process has all key team members talking together through out the design and construction process as they share ideas and use feedback across disciplines to iteratively move toward a high-performing design. approach for underfloor-air distribution, and explain how UFAD can contribute to LEED credits including IEQc6.2. (Subscription Required)

Operable Windows

Operable windows are an appropriate way to meet the requirements for this credit in many building types. A single operable window can serve multiple occupants, as shown here.

LEED Online Forms: NC-2009 IEQ

The following links take you to the public, informational versions of the dynamic LEED Online forms for each NC-2009 IEQ credit. You'll need to fill out the live versions of these forms on LEED Online for each credit you hope to earn.

Version 4 forms (newest):

Version 3 forms:

These links are posted by LEEDuser with USGBC's permission. USGBC has certain usage restrictions for these forms; for more information, visit LEED Online and click "Sample Forms Download."

Design Submittal

PencilDocumentation for this credit can be part of a Design Phase submittal.

173 Comments

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Noriko Yasuhara Woonerf Inc.
Nov 05 2014
LEEDuser Member
1945 Thumbs Up

wall mounted thermal controller

Hi,

Initial design review has just been returned for our project. In the review comment, example of accessibble individual controls are defined as hand-held remote controls or wall-mounted controls located no higher than 48 inches AFF. Our project has wall-mounted controls located higher than 48 inch. Does anyone know whether the location of switch is mandatory to meet this credit? Is it mere recommendation? Any comment would appreciated. Thank you.

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Larissa Oaks Specialist, LEED , USGBC Nov 05 2014 LEEDuser Expert 663 Thumbs Up

Hi Noriko,
There are no specific height requirements for the location of the switch- as long as the occupants can access the control it is acceptable.

Post a Reply
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Kevin Gilleran
Sep 12 2014
LEEDuser Member
266 Thumbs Up

Unconditioned Regularly Occupied Fermentation Room in Winery

We are working on a winery project with an unconditioned fermentation room that is occupied by at least one and up to 4 or 5 people a minimum of 1 hour/day and where people stand and move around throughout the space to do work. We are not sure whether this space should be considered an individual work space or multi-occupant space or about about how to categorize the thermal control of this space since the occupancy is complex and varies year-round and the occupants do not have a set work station, rather they move around between the fermentation tanks. There are three large roll up doors in the space and a large central ceiling fan. Our thought is to use the roll-up doors for the access to operable windows to meet the operable window criteria for this space. Could we calculate the total floor are that is 20 ft inside and 10 ft to either side of the operable doors to determine whether 50% of the space meets this criteria for individual comfort control?

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Ashley Bertling
Sep 11 2014
Guest
6 Thumbs Up

Question: NC 2009 LEED V3 IEQ6.2

Curious to know if I've got this right. Will you be my extra set of eyes? Building a museum. All mechanical ventilation. No opening windows. Currently, each floor is zoned and thermostat controls are located in the corridor of each floor so each floor can control their own temperature.

Basement Level:
3 (part-time use) private offices, 1 (Full time use) shared office with 2 employees and a cafeteria - basic sandwich shop - with 1 Full Time employee.

--Because thermostat controls are centrally located - we could provide ceiling fans in each private office and in the cafeteria to give individual users control of air speed, correct? (I understand this is above the 50% requirement) Would you recommend we install additional controls, outside of a ceiling fan, in the cafeteria?

First Floor:
2 galleries behind closed doors, an open lobby with reception's desk and gift shop with attendance.

--Thermostat controls on first floor are accessible to all employees. If a ceiling fan were installed in the gift shop we would pass?

3rd Floor: open lobby and galleries
--Dedicated to transients so no other form of control besides shared thermostat would be necessary, correct?

4th Floor: banquet hall and lobby
-- Banquet hall is for banquet guests. Thermostat is located in the lobby and controls both the lobby and the banquet hall. Would it be advised to install a ceiling fan, here?

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John Lee
Apr 21 2014
Guest
8 Thumbs Up

Radiant Temperature

What can be considered as a Radiant Temperature control? Do blinds or curtains count if occupant is within 20 feet from the window?

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Dylan Connelly Mechanical Engineer, Integral Group May 02 2014 LEEDuser Expert 7193 Thumbs Up

No. Radiant temperature control would be a thermostat that controls flow to a radiant ceiling or floor zone.

Post a Reply
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J I
Apr 17 2014
Guest
59 Thumbs Up

RH control with dew point control logic for IEQ 6.2

This project is based in highly humid place, we have used dew point control logic for AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. control.

In this control logic, we are controlling 2-way chilled water valve from signal from supply air dew point. VFDA variable frequency drive (VFD) is a device for for controlling the speed of a motor by controlling the frequency of the electrical power supplied to it. VFDs may be used to improve the efficiency of mechanical systems as well as comfort, because they use only as much power as needed, and can be adjusted continuously. is controlled from return air temperature signal.

Set point of supply air dew point is kept at 50F, so that humidity levels in room shall be taken care of during peak latent load condition also. Variations in sensible load are handled by VFD modulation.

We wanted to check with experts from LEED point of view that can we avoid RH sensors ? As you will see from above control logic, we are achieving humidity control through supply air dryness and RH sensor is not playing any controlling role.

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Lauren Sparandara Sustainability Manager, Google Apr 17 2014 LEEDuser Expert 16122 Thumbs Up

Hello,

This LEED credit wouldn't help to answer your question in terms of if you can avoid RH sensors. The key question to ask is if you are providing controls that are helping occupants change one of the key thermal comfort metrics noted above. It's not clear to me from your description whether or not this is the case. You only need to control one of the following:

- air temperature
- radiant temperature
- humidity
- air speed.

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 18 2014 LEEDuser Member 1782 Thumbs Up

The question seems more applicable to a different credit - IEQc7.1 Thermal Comfort Design. For IEQc7.1, I believe your method would qualify as acceptable humidity control without having RH room sensors.

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J I Apr 21 2014 Guest 59 Thumbs Up

Thanks Lauren and Julia for your response.

So to qualify for IEQc 6.2, I have to have individual control for any of the our comfort key parameters to 50% of the occupants?? Though this design approach is acceptable for IEQc7.1 as highlighted by Julia.

Thanks in advance,

Post a Reply
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ANDRZEJ ROMANOWSKI LEED CONSULTANT ANDRZEJ ROMANOWSKI
Apr 11 2014
Guest
14 Thumbs Up

IEQc6 vs IEQp1

Hi,

I work on a CS project ventilated by AHUs and approach both IEQp1/IEQc2 and IEQc6. For getting the IEc6 points both room controllers and operable windows are used. I was given a comment from the USGBC saying I should indicate in the IEQc6 form also "project building is naturally ventilated". This is linked to IEQp1 and IEQc2 form which means an additional table IEQp1-A5 must be fulfilled. The buiding is ventilated mechanically by AHUs and these operable windows can be used only to improve comfort controlability in lieu of room controllers. Therefore presenting calculations confirming proper operation of natural ventilationin the IEQp1-A5 is pointless. I haven't met in the Reference Guide suggestions to rearrange the ventilation priciple in the case of using operable windows for IEQc6.

Thank you in advance

Andrzej

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 11 2014 LEEDuser Member 1782 Thumbs Up

Hi- I also am not aware of the operable windows in IEQ6.2 requiring natural ventilation under IEQp1. However, because the reference guide requires that the operable window area must be at least 4% of the floor area to be influenced in IEQ6.2, it amounts to the same thing. Essentially, you need to prove that the area served by the operable window would qualify per the natural ventilation criteria.
In this case, it is probably best to comply with the reviewer's comment rather than complaining about technicalities. Note that you do not need enough operable window area to ventilate the entire room. You only need to provide the natural ventilation "equivalent" to serve the area you claim will receive the comfort benefit of the operable window.

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Ghaith Moufarege
Mar 24 2014
LEEDuser Member
8332 Thumbs Up

Dear Sirs, We are consultants

Dear Sirs,

We are consultants for a mall seeking LEED. Most of the spaces will be tenanted. The owner will be installing the main HVAC system (Chillers & Boilers), whereas the tenants will fit out their HVAC system later.

I am trying to assess the difficulty in achieving this credit. The mall will contain retail shops, restaurants, and movie theaters (all are tenanted). The C&S areas fitted by the owner are basically the underground parking levels and the mall circulation areas (mall concourse).

My queries below:
1) Generally speaking, is it too difficult to achieve this credit?

2) The mall concourse circulation is occupied by transient occupants. It would not make sense to provide these transients with thermal comfort controls. However, the circulation area has a thermostat which is controlled by the Mall's facility managers if need be. Is this sufficient for complying with this credit?

3) Restaurants & Retail shops will have FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories. employees and transient visitors. Is it sufficient to have 1 thermostat control for each restaurant / retail, and this thermostat operated by the shop's employees (not transients)? If a retail shop has 3 employees, it doesn't make sense to provide 3 controls, as the employees will be constantly moving in the shop (unlike a shared office space whereby each person works on 1 fixed desk).

Thanks!

PS: I posted this under LEED C&S forum a week ago but didn't get any response - I feel that the NC forum is always in action!

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 11 2014 LEEDuser Member 1782 Thumbs Up

Note that core and shell projects must purchase or install the mechanical system or operable windows (or a combination of both) in order to achieve the intent of this credit. The distribution ductwork does not have to be completed, however.
1) If you only have one single-zone unit per shop or restaurant, it is probably too difficult to achieve this credit.
2) Some projects have included a narrative stating that staff will be available to adjust the locally accessible room thermostat if requested by transient occupants. Alternately, the public could have access to a very narrow range of set point adjustment that is automatically reset at the start of each day.
3) I believe a restaurant kitchen would need its own thermostat. The counter area might also need a separate control from the kitchen and dining area, depending on the arrangement. While one thermostat for a multi-occupant retail floor should be sufficient, you would also have to provide separate control for any potential back-of house areas such as a manager's office or a staff break room.

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Fabien Challeat Deputy Project Manager Archetype Group
Mar 20 2014
LEEDuser Member
11 Thumbs Up

Group certification with lockers

I'm working on a factory project, consisting of 7 buildings. Among them, three are lockers buildings (I mean exclusively lockers, without any other spaces). According to IEQ Space Matrix, credits IEQc6.1 and IEQc6.2 are not applicable to lockers, therefore my concern is: can we apply for those credits as a group certification even if 3 of our buildings are not eligible to IEQc6.1 and IEQc6.2?
Another way would be to consider lockers as a multi-occupied space (we have a FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories. of 8 per locker and they are regularly occupied) and then comply with requirements of the credits for all the buildings. Is it an acceptable solution?
Any advise would be appreciated.
Thanks

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Julia Weatherby Senior Mechanical Engineer, Lindgren & Sharples, P.C. Apr 11 2014 LEEDuser Member 1782 Thumbs Up

Because your locker rooms are regularly occupied, I would explain that in a narrative and include them in the credit calculations.

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Donald Green Project Manager Sustainable Design Consulting, LLC
Mar 05 2014
LEEDuser Member
1235 Thumbs Up

Ceiling mounted fans

Can a multi-speed ceiling mounted fan be considered as a thermal comfort control in either a single office space or a multi-occupant space?

It is understood per the Addendum mentioned above that a plug in type is acceptable, however have not been able to find anything that notes a ceiling mounted fan.

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Lauren Sparandara Sustainability Manager, Google Mar 05 2014 LEEDuser Expert 16122 Thumbs Up

Hi Donald,

Yup, that works. That would count as one control.

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Farah A.
Feb 16 2014
Guest
530 Thumbs Up

LEED BD+C Question- Individual Thermal Comfort Controls

A project design team has design their new office space with an open office plan and operable windows to provide natural ventilation. The office will have 65 employees, each with their own workstation, as well as 6 small conference rooms designed for meetings and collaborative space. In order for the project to comply with IEQCredit 6.2 Controllability of Systems, Thermal Comfort, what is the minimum amount of workstations that must be within 20 feet inside and 10 feet to either side of the operable windows?
A. 65
B.59
C. 49
D.33
E. 7

-The answer choice is 49 and I do not understand how! 65 employees- 50% of thermal comfort controls should be 33 controls plus one for each of the 6 conference rooms, right?

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Sylvain laporte GASD-Co Feb 16 2014 Guest 153 Thumbs Up

The question is about workstations only, so i would be tempted to answer 33 . It Seems 49 is obtained by doing 65*0.75 .

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Feb 17 2014 LEEDuser Moderator

Farah, please tell us where these questions are from.

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Farah A. Feb 17 2014 Guest 530 Thumbs Up

Hi Tristan,

The questions are from:

http://www.studyleed.com/leed-ap-bdc---practice-exam-3.html
There are 2 additional practice tests.

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Lauren Sparandara Sustainability Manager, Google Feb 18 2014 LEEDuser Expert 16122 Thumbs Up

Hi Farah,

The question seems to be asking about workstations and workstations only. If that's the case then half of the individual workstations need access to controls. The answer should be 33.

As a side note, all 6 of the conference rooms need controls.

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Catalina Caballero Sustainability Coordinator JALRW Eng. Group Inc.
Dec 13 2013
LEEDuser Member
3150 Thumbs Up

Mechanical and Naturally ventilated together?

We have a project for which we have 3 offices, these have been provided with a shared thermostat that controls a constant volume AC Unit also serving a few other areas. In addition to this mechanical system these offices have operable windows. Can we argue that all 3 offices have are both mechanically and naturally ventilated? Does it have to be one or the other ventilation techniques?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Dec 20 2013 LEEDuser Moderator

Victor, the key aspect of IEQc6.2 is controllability. For this credit, it's not so critical to define whether the space is mechanically or naturally ventilated. Access to operable windows could be a great way to provide thermal comfort control in space.

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Lauren Sparandara Sustainability Manager, Google Dec 23 2013 LEEDuser Expert 16122 Thumbs Up

I agree with Tristan! You can combine windows and thermostats to get to your required number of controls. I have done it many times before. Even though energy efficiency isn't part of this specific credit, you'll probably want to consider that too in your approach.

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Catalina Caballero Sustainability Coordinator, JALRW Eng. Group Inc. Jan 22 2014 LEEDuser Member 3150 Thumbs Up

Thanks this helps a lot. We will give it a try although we are NOT totally counting on the credit since as I mentioned before, it is a constant volume not only serving these offices but other rooms like elect/mech rooms and lobby areas, therefore the unit will stay on all the time, and will not be able to shut down just for natural ventilation of the offices. If anybody has some experience with similar conditions let me know.

Thanks much

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Larry Jones Associate Atelier Ten
Oct 14 2013
LEEDuser Expert
1938 Thumbs Up

Multi-occupant rooms: Are operable windows compliant?

It seems a little unclear, but can operable windows be used for multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. to comply with EQc6.2?

If so, do the windows have to meet the same calculation requirements as windows for individual workstations? (i.e. occupants 20 ft. inside, 10 ft. to either side, window opening size, etc.)

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Lauren Sparandara Sustainability Manager, Google Oct 15 2013 LEEDuser Expert 16122 Thumbs Up

Hi Larry,

Yes, operable windows can be used for multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. to comply with EQc6.2. You would just need to make sure that the window met the needs of the users of the multi-occupant space. For instance, if it was a conference room with a room divider or different programmatic needs then you would need to have an ability to have a variety of controls to suit the variable needs of that space.

Windows would need to meet the same calculation requirements.

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Erica Downs Sustainability & LEED Consultant
Sep 19 2013
LEEDuser Member
2191 Thumbs Up

How to reconcile IEQc6.1 and 6.2 Forms for residential spaces?

The Space Matrix says for residential spaces, each unit needs one thermostat, and the location does not matter. For lighting, we need at least one switch per room. So how do we reconcile the spaces on the forms? If we list the exact same spaces we have for 6.1 (bedrooms, kitchen, living space) in the 6.2 form, it appears we have an inadequate number of thermostats. Any suggestions? Thanks!

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Michael Johnson Architect, Chenevert Architects Sep 20 2013 LEEDuser Member 992 Thumbs Up

im wondering the exact same thing - but posted under the 6.1 credit. Still waiting on help. I also emailed USGBC with question... if I get an answer i'll share here as well.

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Larissa Oaks Specialist, LEED , USGBC Sep 23 2013 LEEDuser Expert 663 Thumbs Up

Hi Erica and Michael,
The current forms do not have residential-specific information. I suggest using the special circumstances section of the form for your project.

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Michael Johnson Architect, Chenevert Architects Sep 23 2013 LEEDuser Member 992 Thumbs Up

thanks, i have a follow up question. on IEQc6.2, i checked "special circumstances" and filled out explanation. but then after saving form, when I hit "check compliance" - it still shows "0".

do I just have to submit it with the "0", even though I expect the 1 point?

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Larissa Oaks Specialist, LEED , USGBC Sep 23 2013 LEEDuser Expert 663 Thumbs Up

Hi Michael,
exactly, submit the form even though it is showing 0 for points documented.

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Erica Downs Sustainability & LEED Consultant
Sep 19 2013
LEEDuser Member
2191 Thumbs Up

Mixed Use Residential with Core & Shell retail on ground floor

hello - We have primarily residential building with two core and shell retail spaces on the ground floor. All the residential units meet the credit requirements, but how do we treat the unfinished retail spaces on the ground floor? Do we follow the C&S requirements just for those spaces? Will one thermostat in each space be sufficient? There are currently no private office areas, just open space. Thanks for any input!

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Catherine Blakemore Architect, LEED AP BC+D, HOLT Architects Sep 19 2013 LEEDuser Member 1423 Thumbs Up

You need to download the C&S Appendix 1. It will give you defaults on how to calculate the FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories. for the space. Also check CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide 10102 for additinal information. If the space will be finished by the Owner you can submit a Letter of Committment saying that when designed and constructed the space to meet the requirements of each Prerequisite and Credit achieved by the intitial LEED project. If it will be fit-out by tenants, then you will need to develope Tenant Guildlines as indicated in CIR 10102.

I have not had a project on which I have had to composed tenant guidelines. Check the Plf-1 postings. I think there are some discussions there and other folks who will be able to offer some additional insight on developing Tenant Guidelines. Hope this helps. 8-)

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Erica Downs Sustainability & LEED Consultant Sep 19 2013 LEEDuser Member 2191 Thumbs Up

Hi Catherine - thanks for the input. I should have clarified, we are registered under NC. I have reviewed the C&S App 1 info, and we have used the default FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories. for other credits such as the SSc4 credits.

However, because there are no private offices or admin areas currently anticipated within the C&S spaces, I would consider both of the C&S retail spaces as entirely "multi-occupant" spaces. Any areas within those 2 spaces would be multi-occupant based on the Space Matrix (merchandising or food service). Typically, one set of controls for a multi-occupant room would suffice, but since we don't have tenants yet, it's a little more complicated. Or am I making it more complicated than it needs to be?

We definitely meet the MPR 2 requirements. Less than 5% of the building will be unfinished C&S space at the time of submission, and these will be rental units.

Seems like the Tenant Guidelines is the way to go. Hopefully the Owner will buy in. Thanks!

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Catherine Blakemore Architect, LEED AP BC+D, HOLT Architects Sep 20 2013 LEEDuser Member 1423 Thumbs Up

Make sure you review the form for this credit. My project is a LEED-NC for Healthcare, so there may be some differences. I put an inquiry into GBCI regarding how to treat undesigned space. Below is my inquiry and GBCI's response.

CUSTOMER INQUIRY:
The noted project is an addition.

2nd Floor is not undetermined, future fit-out space...that may or may not have individual workstations/controls.

3rd Floor does not have any individual workstations. All the spaces are multi-purpose spaces. It's a surgical suit.

4th Floor is a mechanical penthouse.

There is no information to be input into Table IEQc6.2-1 at this point, so the form is telling me we have not complied with all the requirements of the credit.

Can the noted project achieve this credit?
Can the project submit "Special Circumstances" and meet the credit requirements without completing Table IEQc6.2-1?

Thank you for your time and consideration.

GBCI Response:
Thank you for contacting the Green Building Certification Institute about achieving IEQc6.1 without completing the table in the credit form. The unfinished spaces make your case similar to a CS project and not easy to achieve. Please see page 527 of the 2009 LEED Reference Guide for Green Building Design & Construction, June 2010 edition. As you get closed to time to submit, the use of these spaces may be more clear. The credit can always be submitted with the construction credits.

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Annalise Reichert LEED Project Coordinator Environmental Building Strategies
Sep 12 2013
LEEDuser Member
71 Thumbs Up

Two Multi-Occupant Spaces with incomplete wall separation

I am working on an educational facility and all multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. contain thermostat controls except for one classroom. However, this one classroom in particular is only separated by a partial wall from the adjoining classroom that contains a thermostat control, leaving an open space between them. Can I count both classrooms as one space, or do I have to separate them if they are labeled as separate spaces on the floor plans?

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John McFarland Director of Operations, WorkingBuildings, LLC Sep 12 2013 LEEDuser Expert 889 Thumbs Up

Hi Annalise,
How high is the wall? Are they essentially one classroom with a very low wall for some architectural or programmatic purpose? Is there one teacher or two? Perhaps that would be a good judge of whether these are really two classrooms or in reality one.
-John

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Annalise Reichert LEED Project Coordinator, Environmental Building Strategies Sep 12 2013 LEEDuser Member 71 Thumbs Up

Hi John,

Thank you for the quick response. The separating wall between them is full height (14') and there are different teachers in each classroom. Both rooms will be used simultaneously during the day. This leads me to believe I should treat them as separate spaces for the purposes of this credit, correct?

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Lauren Sparandara Sustainability Manager, Google Sep 12 2013 LEEDuser Expert 16122 Thumbs Up

Hi Annalise,

Based off of your description - it seems that each space would benefit from their own set of controls. That being said, I encourage teams to always give it a shot with a special narrative. I would take a look at the intent again. If you think there is a case to be made on how you are still meeting the intent then I would say to give it a try.

Good luck!

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John McFarland Director of Operations, WorkingBuildings, LLC Sep 12 2013 LEEDuser Expert 889 Thumbs Up

Hi Annalise,
With full height walls like you describe, it sure sounds like 2 separate multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. to me. I really think you need separate thermal controls for each. You really don't want the teachers fighting over who gets the thermostat. :-)
Good luck,
John

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Regina Gul Senior Project Manager JLL
Sep 09 2013
LEEDuser Member
105 Thumbs Up

Individual thermal comfort controls

We are working on a LEED 2009 C&S project. The building contains retail spaces on the level -1 and on the ground floor and mezzanine as well, the floors from the +1 to +5 are office floors including private offices, open space, conference rooms etc.
Open space offices and private offices will be provided with chilled beams for cooling and floor convectors for heating and room thermostats connected to BMS system. Conference rooms will be provided with chilled beams as well, room thermostats connected to BMS. Fresh air will be provided from air handling units working with 100% fresh air. LEED requires that minimum of 50% building users have comfort controls. My question is: in case of private offices where there are for example 4 desks, is one thermostat (which controls chilled beams and convectors in the room) per room is sufficient to meet the credit requirements? How to calculate this? Does it mean that we have individaual comfort control for 100% of the occupants of this room? What in case of open space office, where there are thermostats provided per group of chilled beams. For example if there are 50 desks and 25 thermostats, is the credit requirement met? We are also confused regarding retail spaces. There will be installed fan coil units for cooling and heating and thermostats. Shall we document for LEED thermostats for the retail workers or for the customers also? How to calculate the number of thermostats for retail spaces? Please give us an advice as the Reference Guide does not give a clear example.

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 03 2013 LEEDuser Moderator

Regina, sorry for the slow response to your question. If you're still lookign for an answer could you please post it to the CS version of this credit forum? Thanks.

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Juliane Muench
Jul 30 2013
LEEDuser Member
723 Thumbs Up

Mixed strategy, windows and mechanical ventilation?

If I understand the intent of the credit correctly, we have to provide individual controls for every second FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories. in individual spaces or open-plan offices. That means every second person has to be able to control heating, cooling, ventilation or humidity INDIVIDUALLY. It is not enough to separate the open plan office space into zones (of f.ex. zones with 10 FTEs) and give every person in the zone possibility to control the indoor climate for the whole zone. Correct?
We do not have an underfloor systems and it will be difficult to achieve that credit for our open plan offices.
Can we mix the strategy and provide employees with the possibility to open windows within 20 ft from the window (and 10ft on either side) and provide the employees not placed in areas where windows can be opened or further away from windows with adjustable local air diffuses in the same room?
Furthermore we could think about the possibility to provide the employees sitting next to radiators with the possibility to control their temperature and the employees not sitting next to the radiator with adjustable local air diffuses in the same room? This is provided every second FTE has a control.
Thanks,

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Lauren Sparandara Sustainability Manager, Google Jul 30 2013 LEEDuser Expert 16122 Thumbs Up

Hi Juliane,

Yes, you have to provide individual controls for half of your individual workstations. It's actually not necessarily by FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories., but by your workstation count. You might have more workstations than FTE though they are often the same number or very close. You are correct to say that the credit is not achieved through zoning. It can be tricky to achieve in an open office environment though the ways you describe, through using windows and underfloor air diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light. could get you there. A combined effort through multiple controls is perfectly acceptable.

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Mike Fortier
Jul 16 2013
Guest
36 Thumbs Up

Minimum window size

We have an office area with multiple workstations and several small windows that individually do not meet the 4% size requirement of ASHRAE 62.1-2007. Is it possible to "combine" two windows and count them as one control for one workstation as long as that workstation is within the maximum distance to both windows and the combined opening size is at least 4% of the net occupiable area?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 03 2013 LEEDuser Moderator

Sounds doubtful to me. Getting people to operate windows is hard enough, and in this case they'll need to do two windows to get an effective area.

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Lauren Sparandara Sustainability Manager, Google Nov 03 2013 LEEDuser Expert 16122 Thumbs Up

I think you would need to submit a CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide to have a certain answer to this question.

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Donald Green Project Manager Sustainable Design Consulting, LLC
Jun 25 2013
LEEDuser Member
1235 Thumbs Up

Mixed Use Buildings

How are mixed use buildings seen with regard to number of T-stats. About 80% of the building is a Dorm with about 20% being a 2 story office wing. Does each occupant type have to meet the requirements separately?

Reason being - the Dorm has a majority of 2 occupant rooms with several being for 3 occupants. Each dorm room has 1 FCU and 1 t-stat. According to the Space Matrix we only need 1 t-stat per dorm room with no mention of number of occupants, therefore it appears the Dorm meets the requirements. The Office wing although it has numerous t-stats does not currently comply as it has ceiling mounted VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas.'s that serve multiple rooms.

So, how do we take the building as a whole to meet the requirements when it seems the 50% rule is skewed due to the dorm rooms?

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Larissa Oaks Specialist, LEED , USGBC Jul 10 2013 LEEDuser Expert 663 Thumbs Up

Hi Donald,
interesting question!
We don't have a specific rule for this situation, but in general we do not require each occupant type to meet the requirement separately. One of the following options should be acceptable:
1. demonstrate 50% of individual occupant spacesIn individual occupant spaces, occupants perform distinct tasks from one another. Such spaces may be contained within multi-occupant spaces and should be treated separately where possible. Individual occupant spaces may be regularly or non-regularly occupied spaces. in the office area have individual thermal controls.
OR
2. Count the number of occupants in each dorm room as the number of individual occupant spaces for the dorm rooms, and determine how many spaces in the office area are individual occupant. Demonstrate 50% of all individual occupant spaces have individual thermal controls.
For example, if there are 2 occupants per dorm room and 10 dorm rooms, that would be 20 individual occupant spaces with access to thermal controls.

Either way, be sure to include a comment to the reviewer to explain your thought process.
Thanks, Larissa

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Donald Green Project Manager, Sustainable Design Consulting, LLC Jul 29 2013 LEEDuser Member 1235 Thumbs Up

Thanks Larissa - your comment was very helpful and we now feel positive about achievement of this credit.

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Lauren Sparandara Sustainability Manager, Google Jul 30 2013 LEEDuser Expert 16122 Thumbs Up

Excellent!

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Gurneet Singh Sr. Project Manager Environmental Design Solutions
Jun 25 2013
Guest
83 Thumbs Up

Operable Windows Complaint Area

As per the requirement operable window can be counted as control for all the occupants occupants located within 20 feet of the exterior wall and within 10 feet of either side of the operable part of the window. Also the minimum area of the window opening may be 4% of the net occupiable area and as per the example area 20 feet by 20 feet, the opening size per window would need to be 16 square feet to meet the limits used in this credit. My question is if I have a window less than 16 square then can i take less area as complaint area or I need to provide minimum 16 square feet of window. For example, if I have operable window equal to 10 sqft, then can I take an area of 250 sqft and count as control for all the occupants occupants located in this area.

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Jun 25 2013 LEEDuser Moderator

Gurneet, in my opinion.... maybe.

This is prescriptive requirement that is somewhat arbitrary. You might have a good reason for applying it to a slightly different situation, but the point of prescriptive requirements is that they are universally applicable and simple to interpret.

Ulimately it's up to USGBC and LEED to interpret this. You could submit the credit with a narrative argument, or get a CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide, or simply contact them for advice on the situation.

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Stantec IP Stantec, Inc.
Jun 07 2013
LEEDuser Member
419 Thumbs Up

Multiple thermostats averaging

If one VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. box with a reheat coil is serving three private offices, would providing one thermostat for each office, and have the controls average the temperature requirement for each thermostat, and modulate the VAV/reheat coil accordingly, comply with this credits requirements?

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John McFarland Director of Operations, WorkingBuildings, LLC Jun 08 2013 LEEDuser Expert 889 Thumbs Up

No, the configuration and control strategy you describe does not comply with the credit requirements. 50% of the occupants have to be able to control their environmental conditions such that each is thermally comfortable. Your scenario has the distinct possibility of having all three occupants be uncomfortable. You'd need at least 2 VAVVariable Air Volume (VAV) is an HVAC conservation feature that supplies varying quantities of conditioned (heated or cooled) air to different parts of a building according to the heating and cooling needs of those specific areas. boxes to meet the credit requirement. Hope this helps. Good luck!
Best regards,
John

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Lauren Sparandara Sustainability Manager, Google Jun 10 2013 LEEDuser Expert 16122 Thumbs Up

This discussion may also be helpful to reference: http://www.leeduser.com/credit/NC-2009/IEQc6.2?page=0#comment-39062

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Catherine Blakemore Architect, LEED AP BC+D HOLT Architects
Jun 05 2013
LEEDuser Member
1423 Thumbs Up

Applicable or not

My project has one floor that does not have any individual workstations. All the spaces are multi-purpose spaces. It's a surgical suit.

One floor that is not undetermined, future fit-out space...that may or may not have individual workstations/controls. Can we use CS Appendix-1 guidelines to calculate what percentage of individual workstations (controls) would be needed.

In short we are trying to determine if we can achieve this credit with one floor that does not have any individual workstations (controls) and one floor that is future fit-out space.

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John McFarland Director of Operations, WorkingBuildings, LLC Jun 08 2013 LEEDuser Expert 889 Thumbs Up

Hi Catherine,
I think you'd have to have a mandate that the individual workstation controls will be installed to meet the credit requirement. Your logic makes sense to use CS Appendix-1 for the future fit-out floor. Good luck!
Best regards,
John

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Katie Schulze Project Specialist Investive Building Projects
May 07 2013
Guest
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Small study rooms- 2-3 rooms per thermostat

I am working on a library that has tons of spaces that can meet the needs of individuals or multiple occupants. In the case of the small study rooms, I am qualifying them as multi-occupant rooms. All regularly occupied spacesRegularly occupied spaces are areas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building. have supply diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light., including small group study rooms. Often 2-3 small study rooms share 1 thermostat.

Does this disqualify us from pursuing the credit?

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Lauren Sparandara Sustainability Manager, Google May 07 2013 LEEDuser Expert 16122 Thumbs Up

Hi Katie,

Have you seen the EQ Space Matrix for its guidance on Libraries? http://www.usgbc.org/resources/eq-space-type-matrix

"Study Carrels" are listed as Individual Occupant SpacesIn individual occupant spaces, occupants perform distinct tasks from one another. Such spaces may be contained within multi-occupant spaces and should be treated separately where possible. Individual occupant spaces may be regularly or non-regularly occupied spaces.. "Workrooms", the "Circulation Desk", "Reading Area"s are all considered Multi-Occupant SpacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations..

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Lauren Sparandara Sustainability Manager, Google May 07 2013 LEEDuser Expert 16122 Thumbs Up

You have described the study rooms as being group study rooms. In that case it seems that based off the definition of multi-occupant they could count as multi-occupant spacesConference rooms, classrooms and other indoor spaces used as a place of congregation for presentations, trainings, etc. Individuals using these spaces share the lighting and temperature controls and they should have, at a minimum, a separate zone with accessible thermostat and an air-flow control. Group multi-occupant spaces do not include open office plans that contain individual workstations. instead of individual workstations. By definition "Multi occupant spaces are places of congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spacesRegularly occupied spaces are areas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building." your group study space are multi-occupant.

Traditionally, one thermostat for 2-3 small study rooms wouldn't count. However, you're saying that the controllability is coming from changing the air (not the temperature). I think these CIRs below might provide guidance. If occupants can control the speed of the air flow I think you are OK.

LI#1770 MADE ON 05/07/2007
Inquiry

"The project team is providing individual floor air valves each with variable duration (open / close) primary air dampers and multi-position diffusersIn an HVAC context, diffusers disperse heating, cooling, or ventilation air as it enters a room, ideally preventing uncomfortable direct currents and in many cases, reducing energy costs and improving indoor air quality (IAQ). In light fixtures, diffusers filter and disperse light. for occupant comfort conditioning as part of an under floor air distribution system. Individual floor air valves will be provided for a minimum of 50% of the building occupants. The variable duration (open/close) primary air dampers in the floor air valves will be controlled using thermostats. Multiple air valves will be connected to one thermostat, such that there will not be one thermostat for 50% of the occupants. However, all of the local floor air valves include multi-position adjustable floor diffusers which are integral to each floor air valve. At a minimum, 50% of the occupants will have control over the primary air flow direction out of the local floor air valve in their space (comfort zone) by adjusting the multi-position local floor diffuser air outlet. Changing the direction of the air flow inherently changes the speed of the airflow in a given direction. LEED NC v.2.2, First Edition, Reference Guide, p361, indicates: Conditions for Thermal Comfort per ASHRAE Standard 55-2004 include the following as primary factors: air temperature, radiant temperature, air speed, and humidity. The Reference guide also states that, ""Comfort System control, for the purposes of this credit, is defined as the provision of control over at least one of these primary factors in the occupant's local environment"" and that ""Individual adjustments may involve individual thermostat controls, local diffusers at floor, desk or overhead levels, or control of individual radiant panels, and energy system design."" This CIR is to confirm that providing air valves, with multi position diffusers, that allow more than 50% of the occupants to change the direction of airflow out of their floor diffuser (which changes the speed in that direction) will satisfy the LEED credit requirement for thermal comfort."

Ruling

"The applicant is asking whether multi position diffusers that allow changes in direction of airflow satisfy the requirements for individual comfort control for EQc6.2. The applicant is suggesting that changing the direction of airflow inherently changes the speed of the airflow in a given direction, meeting credit compliance by providing control of air speed. Simply changing the direction of airflow in one's workspace does not adequately meet the credit intent to provide individual comfort controls. Individual diffusers must have the ability to regulate the speed of the air leaving the diffuser, not simply the direction of airflow."

LI#1722 MADE ON 03/22/2007
Inquiry

"The project team is providing thermostat controls at all shared multi-occupant spaces in our project and the client would like to provide staff with desktop air purifier units that provide individual occupant control of air speed. The personal air purifier units have the following features: three speeds control, 70o oscillation option, and a four-setting auto-shutoff timer (30 minutes, one hour, two hours or four hours). The units also feature: OzoneGuardT front grill vents that help reduce smog as its breeze cools the space. The manufacturer product information states that the ""OzoneGuardT front grill features a PremAirc catalytic coating that instantly changes ozone (O3) molecules into oxygen (O2) molecules on contact. Per the LEED NC v.2.2, First Edition, Reference Guide, p361, Conditions for Thermal Comfort per ASHRAE Standard 55-2004 includes the following as primary factors: air temperature, radiant temperature, air speed, and humidity. The Reference guide also states that, ""Comfort System control, for the purposes of this credit, is defined as the provision of control over at least one of these primary factors in the occupant's local environment"" and that ""Individual adjustments may involve individual thermostat controls, local diffusers at floor, desk or overhead levels, or control of individual radiant panels, and energy system design."" This CIR is to confirm that the above design solution of providing personal air purifier units at the desktop meets the credit intent and that USGBC will accept the product manufacturer information sheet as part of the LEED credit documentation for this credit?"

Ruling

"The project team is correct in stating that individual control over one of the primary thermal comfort factors (i.e. air temperature, radiant temperature, air speed, and humidity) will satisfy the controllability requirement of this credit. The personal air purifiers described above will provide occupants individual control over air speed. However, the intent of this credit is to make thermal comfort controllability an integral part of the building design for occupants. Therefore, unless the fans/air-purifiers are hard-wired in the building system, they will not satisfy the requirement of this credit. Similarly, plug-in desktop fans will not satisfy the requirement of this credit which deals with providing thermal comfort control as an integral part of the building design. Note that for the purposes of this credit, the fan component of the device is of importance. The air purification feature of the device does not address thermal comfort and thus will not add to the thermal comfort controllability of the device."

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Patrick MacPherson Project Consultant Sustainable Design Consulting
Apr 03 2013
LEEDuser Member
461 Thumbs Up

Dorm - shared FCU and Controls

We have a University Dorm project and it is understood that we would be required to have at minimum 1 control for each dorm room. The mechanical system provided has 1 FCU for every 2 dorm rooms. The question is that within v2.2 there has been projects having this credit approved by using a shared/averaged controls set up with with this same mechanical system and the narrative as follows:

“Student dormitory rooms are provided with a four-pipe fan coil units with a space thermostat. Where a single fan coil unit serves two adjacent student rooms, a space temperature sensor is provided in each room. EMCSEnergy Management and Control System (EMCS) is an energy management feature that uses mini/microcomputers, instrumentation, control equipment, and software to manage a building's use of energy for heating, ventilation, air conditioning, lighting, and/or business-related processes. These systems may also manage fire control, safety, and security. Not included as an EMCS are time-clock thermostats. programing will allow for independent selection of the method of control for each of these fan coil units. Control method 1 (average) - control space temperature based on average of space temperature and an average of space temperature set points. Control method 2 (select sensor 1) - ignore space temperature sensor 2 and control from space temperature sensor 1. Control method 3 (select sensor 2) - ignore space temperature sensor 1 and control from space temperature sensor 2.”

Does this type of controls set up comply with v2009?

Thank you,

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Patrick MacPherson Project Consultant , Sustainable Design Consulting Apr 29 2013 LEEDuser Member 461 Thumbs Up

Can I please get a response to my question from almost a month ago?

Thank you,

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Apr 29 2013 LEEDuser Moderator

Patrick, please see our forum FAQs. That said, I will ask around.

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John McFarland Director of Operations, WorkingBuildings, LLC Apr 29 2013 LEEDuser Expert 889 Thumbs Up

Patrick,
Are the dorm rooms single occupancy or double occupancy? In other words, does the FCU that serves the 2 rooms serve 2 occupants or 4 occupants?

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Dylan Connelly Mechanical Engineer, Integral Group Apr 29 2013 LEEDuser Expert 7193 Thumbs Up

Probably need to do a CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide - have you checked the LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. data base?

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Lauren Sparandara Sustainability Manager, Google Apr 29 2013 LEEDuser Expert 16122 Thumbs Up

Patrick,

Is the quoted area you have provided from a narrative you have submitted form a LEED-NC v2.2 project before and, if so, what was the language from the reviewer when they accepted it? I reviewed the Interpretations database and did not find any specific guidance on your question. You might want to take a look again and make sure I didn't miss it: http://www.usgbc.org/leed/developing-leed/interpretations

In principal if it worked for a NC v2.2 project it should also work in this case. They key is in proving that controllability - per room - exists. Based off of your description it does sound like controls exist in each room.

I agree with Dylan that the way to know for sure is to submit your own CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide to the USGBC.

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