CS-2009 IEQc5: Indoor Chemical and Pollutant Source Control

  • CS_IEQc5_Type1_IndoorPollutant Diagram
  • A smorgasbord of requirements

    This credit requires compliance with a varied group of items that cumulatively help keep pollutants out of the indoor air. These requirements include self-closing doors on janitors' closets, MERVMinimum efficiency reporting value. 13 filtration on mechanical equipment, and entryway trackoff systems.

    Compliance will require the coordination of team members—including the mechanical engineer, architect, plumbing engineer, and contractor—and also impact project design and operations. The basic requirements are:

    • Permanent entryway walk-off systems at least 10 feet long (up from 6 feet in previous versions of LEED) at all regularly used, exterior-to-interior entrances and entrances from covered parking garages. (Roll-out mats are acceptable only if maintained on a weekly basis.) 
    • Designated exhaust of all hazardous gas and chemical use areas—including garages, housekeeping, janitors’ closets, laundry areas, science labs, art rooms, workshops, copy and printing rooms, and prep rooms.
    • An exhaust rate of 0.5 CFM/SF, with no air recirculation, in hazardous gas and chemical use areas.
    • Self-closing doors on all spaces outlined above.
    • Deck-to-deck partitions or hard-lid ceilings on all spaces outlined above.
    • MERV 13 filtration for each ventilation system serving 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. with outdoor air.
  • Core and shell scope

    Core-and-Shell (CS) projects must meet all the relevant credit requirements for the CS scope of the building, including work done as part of the base building in future tenant spaces. (This requirement does not appear in the credit language or Reference Guide, but is included in the LEED Online credit form.) Among other things, the requirements apply to common areas and base-building mechanical ventilation systems.

    In order for a CS project to comply with the credit requirements, you must either meet all of the requirements for the entire building or include the requirements in binding language in the tenant sales or lease agreement. This may also overlap with tenant design and construction guidelines being developed for SSc9: Tenant Design and Construction Guidelines.

  • Keep dirt out!

    In addition to tobacco smoke, covered in IEQp2, one of the greatest sources of indoor pollutants is the dirt and other contaminants brought into buildings on people’s shoes. This material is tracked through the building interior, increasing the need and frequency for cleaning, and the wear on interior finishes. Dust can also be introduced into ventilation systems and distributed throughout a building, negatively effecting indoor air quality. 

    Fairly straightforward, but some pitfalls

    While it takes a lot of coordination to meet the many credit requirements, this is generally a low-cost credit. The most significant impact may come if MERVMinimum efficiency reporting value. 13-compatible air-handling equipment is not initially specified, as redesigning mechanical systems can be costly. In some situations, especially when using heat pumps, HVAC systems cannot accept MERV 13 filters because they are not able to draw air through such a thick filter.

    MERV 13 filtration results in an energy-use trade-off. While MERV 13 filters offer a greater level of air filtration and, consequently, increased indoor air quality, they also increase resistance to airflow and fan energy loads. If you can separate space conditioning from ventilation and use radiant systems for all or most of the space conditioning, you can minimize this energy penalty.

  • Containment requirement has been removed

    When LEED 2009 was launched, this credit included language calling for containment drains in laboratory spaces where chemicals are mixed. However, the requirement was vague and it wasn't clear how to document it. Fortunately, in the July 2010 LEED addenda issued by USGBC, this requirement was removed.

    FAQs for IEQc5

    Should track-off mats being used on the project to meet IEQc5 requirements be included in IEQc4.3 credit requirements?

    There is no definitive information from USGBC on this one way or another. It is recommended that project teams do their best to find low-emitting options for IEQc5, and that IEQc4.3 compliance is recommended.

    However, LEEDuser has heard that project teams have had success not including track-off mats, such as the type with grilles and small strips of carpeting. Also, mats that are removed for cleaning are not permanently installed and thus not subject to credit requirements. If used as track-off surfaces, carpet tiles should be certified, however, and are available with the requisite certifications.

    What is the definition of a high-volume copier?

    There is not an official glossary definition that LEEDuser is aware of. However, various references indicate that LEED views "high volume" as one or more printers in an area totaling more than 40,000 copies (20,000 double sided) per month. The number is based on "expected" use, not capacity. This definition can be found in 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. #1938 issued 1/7/2008, for example, and although that Interpretation is not applicable to LEED 2009, the number 40,000 has appeared in enough places that we view it as a solid number.

    Do I need to provide dedicated exhaust for my printer or copier?

    If the copiers print less than 40,000 pages/month (20,000 pages double-sided) you do not need to install dedicated exhaust, self-closing doors and deck-to-deck partitions. Additionally, if you use printers that do not emit VOC’s or other harmful contaminants into the indoor environment, you can make a case for exemption.

    I do not have 10' of space inside my building entrance to install a walk-off system. Can I include one on the exterior? Can the shape be irregular?

    LEED Interpretation #10098, dated 8/1/2011, states that "The intent for the entryway system (grilles, grates, walk-off mats) is to capture dirt and dust. An exception to the 10 foot length and/or indoor location is acceptable provided your alternative solution meets this intent and is thoroughly justified."

    Project teams have been successful including exterior mats that are protected from the weather and regularly cleaned. LEEDuser has not heard of a project successfully gaining an exception to the 10-foot requirement, however. In situations where an irregular shaped mat makes sense, teams should consider whether people entering the building will travel at least 10 feet over a mat, and not be able to short-circuit it. A short narrative explaining the impediments and how your solution meets the standard established by the LEED Interpretation is recommended.

    What does ‘regularly used exterior entrance’ mean and how do I know which of my building entrances falls under this category?

    These entrances are those that are used by building occupants on a regular basis. If your project has unique circumstances where certain building entrances are not regularly used or do not serve building occupants, they may be excluded. For example, emergency exits that are not used as regular entrances can often be excluded.

    Are entryway mats required for a building entrance from another building?

    LEED Interpretation #5266 made on 05/30/2007 states that the requirements are applicable only to entrances from the outdoors.

    Can I use carpet tile as a track-off system? What about carpet?

    Yes, carpet tile applies per LEED Interpretation Ruling #10252. Some project teams have preferred to use carpet tile due to ease of maintenance and avoidance of trip hazards. The carpet tile must be specifically designed for entryway systems. Regular carpeting that is not designed for this purpose and does not have regular cleaning is not applicable.

    Our building has a green cleaning program and is earning an ID credit for it, based on the LEED-EBOM IEQc3 requiremets. Can we skip the exhaust requirements for our janitor rooms?

    LEEDuser has not seen an official ruling on this, but our expert consensus is no.

    One, replacing a physical control with a policy control is a bit of a downgrade. Two, 100% avoidance of hazardous chemicals in cleaning is unlikely. The green cleaning purchasing credit in EBOM, for example, considers 30% good enough to earn the credit. Also, the thresholds, categories, and standards referenced in that credit will only go so far in preventing use of any cleaning supplies that might generate gases or chemicals that should be exhausted.

Legend

  • Best Practices
  • Gotcha
  • Action Steps
  • Cost Tip

Pre-Design

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  • Identify programming requirements for special-use spaces such as high-volume copy rooms (40,000 pages or more per month), laboratories, art rooms, chemical storage, housekeeping areas, and other spaces that may expose occupants to hazardous materials. 

    • Remember that if you need additional ductwork for designated exhaust systems for these areas, you’ll need to allow space for it.
    • Include deck-to-deck partitions or hard-lid ceilings, and self-closing doors, in these spaces. 
    • Battery banks, such as uninterruptible power supplies (UPS), have to be segregated from other use areas.

  • Identify space requirements for entryway walk-off mats. Review the impact that the required ten-foot entryway systems will have on common areas, lobbies, and other interior spaces adjacent to building entries. Remember that the entryway systems have to be installed at all regularly used entrances from exterior spaces, including entrances from a covered parking garage into the building. 


  • The LEED Reference Guide states that entryway systems need to be on the interior of the building or in an interior vestibule. It is recommended that projects pursuing this credit with the intent of using an exterior entryway system (either permanent or rollout) consult the GBCI or your certification board via email to verify credit compliance. It is usually accepted that exterior walk-off systems are allowed if they are properly sheltered from weather; that would typically mean some kind of roof, but additional shelter may be warranted depending on local conditions.


  • Review the potential for using MERV 13 filtration on ventilation systems. Systems with low fan power or filtration size limits may not be able to accommodate MERV 13 filters. 


  • If you can use radiant heating and cooling for space conditioning and separate that function from ventilation, you’ll be moving a lot less air and meeting the MERV 13 requirement won’t be nearly as big a deal, due to fewer and smaller ducts and filters.


  • Identify what areas and systems will be in the CS scope, and also the tenant fit-out scope or space. You have to meet the credit requirements for everything in the CS scope, and for tenant fit-out areas, require that those spaces meet relevant requirements.


  • Include mechanical engineers and design consultants for special-use spaces such as science labs early in the design process. 


  • This is usually a low-cost credit. However, the MERV 13 filtration requirement can increase operational costs for added energy use and more frequent filter changes. If your ventilation system is not typically sized to accommodate a MERV 13 filter, you may have to choose a new system or have one custom-designed, which can add cost. Customization may include resizing ductwork, increasing fan capacity to maintain air delivery despite the added resistance of MERV 13 filtration, or other modifications to system design

Schematic Design

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  • Design an adequate space for ten-foot entryway systems at all regularly accessed building entries. Evaluate all other building entrances—such as employee and service doors—for regular use, which may require entryway systems or roll-out mats.


  • Determine the type of entryway system that's best for your project. If you install permanent grates, grilles, or slotted entry systems, you will not be required to have a plan for cleaning, although those systems will still need periodic cleaning (less frequently than roll-off mats). However, if you decide to use rollout mats, you'll need to have a contract in place for weekly cleaning. The contract for weekly cleaning can be incorporated into any existing contract but must be clearly spelled out. 


  • While roll-off mats are acceptable, additional documentation (service contracts and schedules) is required to confirm that the mats will be cleaned on a weekly basis. They cost more up-front, but permanent entryway systems provide better performance, require less maintenance, and are easier to document for LEED compliance.


  • Entryway systems should be climate-specific. For example, regions with high rainfall may choose high void-volume mats—for trapping dirt below the mat surface and fast drying. In regions where mud and snow are a greater source of contaminants, open-loop entry mats may be more appropriate. 


  • Design in space for additional ductwork that might be needed to provide designated exhaust for all garages, high-volume copy rooms, janitors’ closets, science labs, workshops, art rooms, or any other spaces that may be used for mixing and storage of chemicals or hazardous materials. You need to design the exhaust system so that each space with hazardous material has negative pressure in respect to adjacent spaces. For each of these spaces, be sure to include self-closing doors, and deck-to-deck partitions or hard-lid ceilings. 


  • Strategies for space planning may include:

    • Stack common-use areas so that all janitors’ closets are located in the same place on each floor, then run a single exhaust duct vertically through the building for each exhaust fan to tie into.    
    • Add height to the deck-to-deck elevation to provide extra space above finished ceilings for ductwork.
    • Locate rooms identified as containing hazardous material adjacent to outside walls to reduce the need for more ductwork.

  • When planning for space allocation to meet credit requirements, consider strategies like merging exhaust systems into a single, main, designated exhaust, or stacking chemical use areas over each other on different floors to minimize ductwork. 


  • Provide adequate space for storage and containment of hazardous liquids. 


  • Hazardous storage containers should be located in a secure area outdoors and away from air intakes. 


  • Develop an outline of all the IEQc5 requirements that apply to your project, and confirm that the schematic design accommodates each one. 


  • Adding ductwork to meet credit requirements can add costs; incorporate space-planning strategies to minimize this issue. 

Design Development

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  • Once programming and space allocations have been determined, confirm that each of the relevant credit requirements is met, as detailed below.


  • Confirm that all mechanical ventilation systems can accommodate MERV 13 filtration on outdoor and make-up air supply. 


  • If roll-out mats are used, make selections appropriate to the climate. The following specifics are also recommended in the LEED Reference Guide: 

    • fire retardant ratings better than DOC-FF-1-70, such as NFPA-253, Class I and II   
    • electrostatic propensity levels < 2.5 kV 
    • a contract for weekly cleaning of roll-out mats (required).

  • Confirm that all mechanical ventilation systems can accommodate MERV 13 filtration on outdoor and make-up air supply. 


  • Confirm that chemical disposal areas meet local codes for separate drain lines or containment drains. 


  • Confirm that all chemical storage areas, high-volume copy rooms, etc. have:

    • deck-to-deck partition walls or hard-lid ceilings;
    • self-closing doors;
    • designated exhaust (no recirculation); and 
    • an exhaust rate of 0.5 CFM/SF, with a pressure differential in relation to surrounding spaces of at least 5 Pa (0.02 inches on water gauge), on average or, when doors are closed, 1 Pa (0.004 inches on water gauge), at a minimum.

  • Locate hazardous waste storage containers away from outdoor air intakes. 

Construction Documents

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  • Develop all required documentation for LEED submittal, including floor plans indicating locations and lengths of entryway systems, wall details (for deck-to-deck partitions), mechanical drawings showing locations of designated exhaust systems, and mechanical schedules specifying MERV 13 filtration. 


  • For all spaces that may contain hazardous gas (such as garages, janitors' closets, and labs), calculate exhaust rates to confirm adequate negative pressurization. The pressurization requirements are: 

    • an exhaust rate of 0.5 CFM/SF with a pressure differential in relation to surrounding spaces of at least 5 Pascals (Pa)—.02 inches on water gauge—on average;
    • and when doors are closed, 1 Pa—.004 inches on water gauge—at a minimum.

  • Include credit requirements in all appropriate specification sections. Include the general requirements in Division 1 and others in specialties or furnishings (for the entryway systems) and HVAC (for filtration and other mechanical requirements).


  • Projects that use their own maintenance staff for regular cleaning of rollout entryway systems must provide a cleaning schedule and narrative along with their documentation. 


  • Develop documentation customized for LEED submission—complete with LEED-related notes, callouts, and details—concurrently with the finalized construction documents. 


  • The contractor is the signatory for IEQc5, even though it's a design credit. Have the contractor review 100% of the construction documents to confirm compliance before completing the design submittal. Otherwise, the credit may have to be deferred until the construction submittal. 

Construction

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  • Use temporary ventilation systems instead of the permanent HVAC units during construction. This prevents contamination of new ductwork during the construction process. 


  • Use MERV 8 filtration on any permanent mechanical system equipment used during construction. This adds to construction management tasks and could easily be overlooked and lead to loss of the credit. (This requirement appears in the LEED Online credit form as of 10/09, even though it does not appear in the credit language or LEED Reference Guide.)


  • Make sure that compliance and coordination with this credit is called out in the IAQ management plan if your project is pursuing IEQc3.1: Construction Indoor Air Quality Management Plan—During Construction


  • Ventilation and exhaust systems and proper filtration should be included in the commissioning scope for the commissioning credits EAp1 and EAc3.  

Operations & Maintenance

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  • Provide appropriate training for maintaining entryway systems. If roll-out mats are used, maintain a weekly schedule for cleaning.


  • Provide adequate training and education for all O&M and cleaning staff in appropriate handling, use, storage, and disposal of hazardous liquids.


  • Provide appropriate resources and training for O&M personnel to maintain mechanical equipment with MERV 13 filters. 


  • Mechanical systems have to be commissioned to meet the commissioning prerequisite EAp1. The commissioning agent's scope should include confirming appropriate MERV ratings on filtration media and proper operation of designated exhaust systems. 

  • USGBC

    Excerpted from LEED 2009 for Core and Shell Development

    IEQ Credit 5: Indoor chemical and pollutant source control

    1 point

    Intent

    To minimize building occupant exposure to potentially hazardous particulates and chemical pollutants.

    Requirements

    Design to minimize and control the entry of pollutants into buildings and later cross-contamination of regularly occupied areas through the following strategies:

    • Employ permanent entryway systems at least 10 feet long (3 meters) in the primary direction of travel to capture dirt and particulates entering the building at regularly used exterior entrances. Acceptable entryway systems include permanently installed grates, grills and slotted systems that allow for cleaning underneath.

      Roll-out mats are acceptable only when maintained on a weekly basis by a contracted service organization.

      Projects that do not have entryway systems cannot achieve this credit.

    • Sufficiently exhaust each space where hazardous gases or chemicals may be present or used (e.g. garages, housekeeping and laundry areas and copying and printing rooms) to create negative pressure with respect to adjacent spaces when the doors to the room are closed. For each of these spaces, provide self-closing doors and deck-to-deck partitions or a hard-lid ceiling. The exhaust rate must be at least 0.50 cubic feet per minute (cfm) per square foot (0.15 cubic meters per minute per square meter), with no air recirculation. The pressure differential with the surrounding spaces must be at least 5 Pascals (Pa) (0.02 inches of water gauge) on average and 1 Pa (0.004 inches of water) at a minimum when the doors to the rooms are closed.
    • In mechanically ventilated buildings, each ventilation system that supplies outdoor air shall comply with the following:
      • Particle filters or air cleaning devices shall be provided to clean the outdoor air at any location prior to its introduction to occupied spacesOccupied Spaces are defined as enclosed spaces that can accommodate human activities. Occupied spaces are further classified as regularly occupied or non-regularly occupied spaces based on the duration of the occupancy, individual or multi-occupant based on the quantity of occupants, and densely or non-densely occupied spaces based upon the concentration of occupants in the space..
      • These filters or devices shall meet one of the following criteria:
        • Filtration media is rated at a minimum efficiency reporting value (MERVMinimum efficiency reporting value.) of 13 or higher in accordance with ASHRAE Standard 52.2
        • Filtration media is Class F7 or higher, as defined by CEN Standard EN 779: 2002, Particulate air filters for general ventilation, Determination of the filtration performance
        • Filtration media has a minimum dust spot efficiency of 80% or higher and greater than 98% arrestance on a particle size of 3–10 µg.
      • Clean air filtration media shall be installed in all air systems after completion of construction and prior to occupancy.

    Potential Technologies & Strategies

    Design facility cleaning and maintenance areas with isolated exhaust systems for contaminants. Maintain physical isolation from the rest of the regularly occupied areas of the building. Install permanent architectural entryway systems such as grills or grates to prevent occupant-borne contaminants from entering the building. Install highlevel filtration systems in air handling units processing both return air and outside supply air. Ensure that airhandling units can accommodate required filter sizes and pressure drops.

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.

Web Tools

Janitorial Products Pollution Prevention Project

The Janitorial Products Pollution Prevention Project is a governmental and nonprofit project that provides fact sheets, tools, and links.


Design Tools for Schools - U.S. EPA

According to the website, IAQIndoor air quality: The quality and attributes of indoor air affecting the health and comfort building occupants. IAQ encompasses available fresh air, contaminant levels, acoustics and noise levels, lighting quality, and other factors. Design Tools for Schools “provides both detailed guidance as well as links to other information resources to help design new schools as well as repair, renovate, and maintain existing facilities. Though its primary focus is on indoor air quality, it is also intended to encourage school districts to embrace the concept of designing High Performance Schools, an integrated, whole building approach to addressing a myriad of important—and sometimes competing—priorities, such as energy efficiency, indoor air quality, daylighting, materials efficiency, and safety, and doing so in the context of tight budgets and limited staff."

Publications

Keeping Pollutants Out: Entryway Design for Green Buildings

Environmental Building News feature article describing the benefits and design choices for entryway walk-off systems.


Air Filtration in Buildings

Environmental Building News feature article explaining the various types of air filters, how their performance is measured, and ways to optimize their effectiveness.


Air Filtration Can Make Breathing Easier

Facilitiesnet article covering the basics of air filtration, drawbacks and benefits, standard practices and basic concepts.


Air Filter, Inc. Table

Table of filtration efficiencies and their subsequent filtration properties and common applications. Good background on MERVMinimum efficiency reporting value. 13 filtration.

Entryway Systems

A floor plan like this project example is required to document the presence of entryway track-off systems, length and location. Note that this sample shows six-foot entryway systems because the project predated LEED 2009. For LEED 2009, the systems need to be ten feet in length.

Design Submittal

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

85 Comments

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Mark Stromberg
Jul 09 2014
LEEDuser Member
128 Thumbs Up

Self Closing Doors

Will the mechanical room which has all the chillers be considered hazardous space? If it will be, do we need to provide self closing doors in this room for this credit?

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Michelle Halle Stern LEED Fellow, The Green Facilitator Jul 09 2014 LEEDuser Expert 67 Thumbs Up

The mechanical room is not considered a hazardous space, unless there is some specific emission beyond the ordinary. The credit is designed to address chemical processes, and other contaminants introduced into the space by either operations or equipment (i.e. printers/copiers).

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Jeffrey Goupil Senior Associate Aedas
Jun 03 2014
Guest

Entrance Systems

I have (2) questions regarding the placement of entryway systems.

1) Our project contains several grade level retail suites. From previous threads, I see that these will likely be considered to be "regularly used" triggering the requirement for entrance systems. These, however, are shell spaces at this time. In order to allow the future retailer maximum flexibility in the design of their space, could binding language be written into the lease agreement calling for either the tenant to install a permanent entrance mat system or a contract for weekly maintenance of roll up mats in lieu of permanently installed mats?

2) We have an outdoor roof terrace on level 2 of the project. Would the door to the terrace be considered a "regularly used building entry" requiring an entrance system? It's a gray area, but it seems that as the terrace is subject to "pollutants" (dirt, dust, pollen, etc.), that an entrance mat should likely be installed.

Thanks!

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Michelle Halle Stern LEED Fellow, The Green Facilitator Jun 06 2014 LEEDuser Expert 67 Thumbs Up

1) Since your project is core and shell, tenant guidelines are technically optional. However when I worked on a NC project with tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space., an unwritten requirement was that tenant guidelines were required to preserve the integrity of the NC certification. I think that should apply here as well. If the entrances are regularly used you should either put in entryway systems or require the retail tenant to do so.

2) Entry mats at an outdoor terrace are a good idea for the reasons you stated, and jibe with the intent of the credit.

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Maria Isabel Conde Owner Aqua Terra (Panama) S.A.
Apr 03 2014
LEEDuser Member
30 Thumbs Up

Garage entrances to building

Hi,

We have a project with 7 parking floors. Every floor have an entrance with access to elevators and stairs. We want to know if that entrances should be closed. In other words, we net to put at least a glass wall and a door?.

Thanks in advance.

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MM K
Mar 26 2014
Guest
1189 Thumbs Up

Car park in basement

If only four car parking spaces are located within the basement of the building, will they require separate exhaust even if they are not used regularly?

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MM K
Mar 26 2014
Guest
1189 Thumbs Up

Convenience printers/copiers

How do we show that the printers/copiers to be installed are just convenience ones and therefore will not require separate exhaust?

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Heather Park
Jan 09 2014
LEEDuser Member
23 Thumbs Up

IEQc5 - Average Pascal Calculation

Hi everyone, our engineer has a question about calculating the average pascal. His exact questions is:

"...but I do not know what they are looking for with the “Average Pressure Differential”. I have found an equation to use which I feel is for the minimum, but I have not been able to find anywhere anything that says what LEED is looking for with the average."

If it helps, here is the information he has filled in on the LEED template for one room.
Room Area = 99 sf
Exhaust Rate = 1.5 cfm/sf
Minimum Pressure Differential = 3.3pa

Any guidance is greatly appreciated! Thanks

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Dylan Connelly Mechanical Engineer, Integral Group Jan 24 2014 LEEDuser Expert 6798 Thumbs Up

If you are continuously exhausting the space during occupied hours - your average and minimum are the same.

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Alicja Bieszyńska Skanska
Sep 05 2013
LEEDuser Member
981 Thumbs Up

entryway walk-off system in front of each retail shop in CS?

Our project is a mixed use building where groundfloor constitutes retail services and floors from one up are for tenants.

Taking into account that this is a CS certification, do we need to install entryway walk-off system in front of each retail shop? I would add information that there is no entrance from the shops to the interior of the building. Only one external door.

My way of thinking is that in this case the retail point is not a part of the Core and Shell (and we don't know who will rent it yet), especially that it's a individual shop without any connection to the building's interior.

Please correct me if I'm wrong...
Thanks!

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 04 2013 LEEDuser Moderator

Alijca, I would differ with you. The retail shops are interior spaces that need to be protected, as with any other part of the building.

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Esteban Martinez LEED Consultant Green Loop
Jul 24 2013
LEEDuser Member
185 Thumbs Up

MERV 13 for Make-up air?

We have a Cafeteria-Restaurant space complying with 62.1 throughout an exhaust system with make-up air directly from the outside. All others 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. within the building are using a DOAS with MERVMinimum efficiency reporting value. 13 filtration media. Does the make-up air for the Cafeteria-Restaurant need to be filtrated using MERV 13?

Thanks in advance

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Dylan Connelly Mechanical Engineer, Integral Group Jul 24 2013 LEEDuser Expert 6798 Thumbs Up

Esteban,
It would be safe assume so. We have a similar project and are providing MERVMinimum efficiency reporting value. 13 filters on the kitchen make up air system.

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Patrick Nall TBD+ Architects
Jul 19 2013
LEEDuser Member
22 Thumbs Up

IEQc5 - MERV 13 Filtration

Does anyone know if the requirements of this credit can be met with a split-system for an exercise room if the outdoor air ONLY has the MERVMinimum efficiency reporting value. 13 filtration? There is no return air on the unit.

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Dylan Connelly Mechanical Engineer, Integral Group Jul 21 2013 LEEDuser Expert 6798 Thumbs Up

Patrick,

This seems fine.

If you have no return I assume you are direct ducting the return of the spilt unit to the outside. Then you are putting MERVMinimum efficiency reporting value. 13 filters in that duct or the back of the split unit. How is the air exiting the space? Do you have constant exhaust? Or a relief?

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Regina Ng
Jul 03 2013
LEEDuser Member
1005 Thumbs Up

Natural Ventilated Carpark

How do I calculate the pressure differential between the carpark lift lobby when the carpark is naturally ventilated?

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Dylan Connelly Mechanical Engineer, Integral Group Aug 13 2013 LEEDuser Expert 6798 Thumbs Up

Call the car park neutral. Pressurize the adjacent lobby.

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MM K
May 03 2013
Guest
1189 Thumbs Up

Core and shell dedicated exhaust systems?

Do the projects under core and shell have to providde dedicated exhasut systems for tenant print or copy rooms? The guide seems to say that they don't need to but they ask to include this in the lease agreement? What should be included?
Thanks"!

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Dylan Connelly Mechanical Engineer, Integral Group Jul 21 2013 LEEDuser Expert 6798 Thumbs Up

M K

There should be previsions made to allow for exhaust of those space to be installed by a tenant during a TI build out. Typically we leave capped ducts in a convient places off of the base buildings restroom exhaust system. The exhaust fans should be capable of handling the extra exhaust flow from those spaces in the future.

In addition, put it in the lease agreement as you stated.

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MM K
Apr 29 2013
Guest
1189 Thumbs Up

Sharing the system with toilets

Can this be achieved if the cleaner's cupboard and the toilets share the same extract system?

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Dylan Connelly Mechanical Engineer, Integral Group Apr 29 2013 LEEDuser Expert 6798 Thumbs Up

Yes, the systems can be combine as long as they don't recirculate back into the building supply

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Nathan Lee Project Engineer SGS Korea
Apr 26 2013
Guest
441 Thumbs Up

Average Pressure Differential Calculation - Underground Parking

We have 6 Floors of Underground Parking on a high Multi-Use Tower. Total Project size is over 1,000,000 sqft and the parking areas are approximately 25,000 sqft to 30,000 sqft per floor.

With regards to the hazardous gas and chemical use areas, would we have to comply fully with maintaining negative pressure and self closing doors for the entire parking area at each floor? Or can we show compliance through sufficient exhaust and ventilation?

Any input would be much appreciated.

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Adam Targowski Owner ATsec
Jan 31 2013
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1637 Thumbs Up

exhaust systems for hazardous gas and chemical use areas

All hazardous gas and chemical use areas have to have appropriate ventilation systems. Does it mean that these areas have to have separate exhaust systems from areas without hazardous contaminants like for example offices? Or can these areas be served by the same exhaust system as offices if this air is not recilculated and there's no way that contaminated air gets to other rooms?

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Dylan Connelly Mechanical Engineer, Integral Group Mar 22 2013 LEEDuser Expert 6798 Thumbs Up

Adam,
For LEED your approach (use a common exhaust system for hazardous gases and general office exhaust) would be acceptable. Check with local code however. It's not a problem to have copiers, janitors closets, and restrooms all on the same common exhaust system, but local code may have issues with combining those with lab exhaust, etc.

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Adam Targowski Owner ATsec
Jan 29 2013
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1637 Thumbs Up

no space for 10 feet long walk-off mats in cafes

Entryway walk-off systems at least 10 feet long will be installed in all regularly used entrances to the shopping mall we are working on. But what if there are a few small cafes on the groundfloor were you can enter directly from the outside? Since usually this kind of places are quite small there's no space to put walk-off mats that are 10 feet long. Was anyone facing this kind of problem? Can we consider this to be special circumstances that preclude documentation of credit compliance and provide shorter mats for these few places?

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Jan 29 2013 LEEDuser Expert 6055 Thumbs Up

Adam- USGBC/GBCI have been very consistent in reviews that not having enough space is not an acceptable special circumstance that would allow you omit walk-off mats at any regularly used entries. You may be able to provide a portion of the required 10 feet outside the space if you can show that it is protected from the weather by overhangs or roofs.

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Sandra Holmström environmental consultant Bengt Dahlgren AB
Dec 03 2012
LEEDuser Member
128 Thumbs Up

What means with "regularly used exterior entrances"?

Does regularly used exterior entrances means that you can ignore all other entrances except the main entrance to the building? If not, what kind of entrances should meet the credit?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Dec 03 2012 LEEDuser Moderator

Sandra, you need to consider all entrances to the building, and make sure that any "regularly used" entrances meet the requirements. A fire exit, for example, is not regularly used, but a side door that employees enter through  would need to be considered.

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Julie Hendricks Director of EcoServices, Kirksey Dec 05 2012 LEEDuser Member 930 Thumbs Up

Tristan or other experts-- what about an event space? Do you think the space is "regularly used" if it is not used every day? We have a large meeting room that is attached to the ground floor of an office building. It's entrance will be used for large special events only.

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Dec 05 2012 LEEDuser Moderator

Julie, I would almost certainly include that space/entrance. I don't think "regularly used" has to be defined as "daily."

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Michael Smithing Director - Green Building Advisory, Colliers International Mar 29 2013 LEEDuser Member 1974 Thumbs Up

The showers and changing rooms in our building are only accessible from the building exterior. You park your bike, enter the shower area, change and exit the building. While it would technically be possible to install a walk-off mat, this would create significant maintenance problems as the showers would be much closer to the mat than the entrance.
Does this qualify as an entrance to the building as it is not possible to actually access the building from this area?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Apr 02 2013 LEEDuser Moderator

Michael, it seems consistent with the intent to either exclude this entrance or to use a shorter walk-off mat under LI #10098. I would discuss it in your review and solve to the best of your ability with reference to the intent.

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Michael E. Edmonds-Bauer Edmonds International
Nov 15 2012
LEEDuser Member
1436 Thumbs Up

Leasing agreement

Does the MER13 need to be requested to future tenants by a leasing agreement?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 24 2012 LEEDuser Moderator

Michael, see CS Appendix 4 in the LEED BD&C Reference Guide. The answer you'll find there is.... yes.

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Michael E. Edmonds-Bauer Edmonds International Dec 12 2012 LEEDuser Member 1436 Thumbs Up

Thank you Tristan!!

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Melissa Vernon Director of Sustainable Strategy Interface
Nov 06 2012
LEEDuser Member
559 Thumbs Up

Carpet tile approved as acceptable walk-off mat

Carpet tile is now an acceptable entryway system per 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. Ruling ID#10252 https://www.usgbc.org/leedinterpretations/LISearch.aspx?liaccessid=10252

Carpet tile is a highly desired walk-off mat due to its ease of maintenance as compared to mechanical systems, avoidance of trip hazards associated with roll-out mats, and many other factors. Carpet tile captures and hides soil, requires minimal maintenance and helps prevent slips and falls. The solid backing prevents soil and moisture from penetrating the tile and seams. Carpet tiles allow for easy replacement of damaged tiles.

The carpet tile must be specifically designed for entryway systems, conventional carpet is not acceptable.

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Jens Glöggler Dipl.Ing ATP sustain
Jul 18 2012
Guest
259 Thumbs Up

natural ventilation in underground parking?

Hello,
is it possible to aim the credit IEQc5 if a project doesn't have a mechanical ventilation in the underground parking (UP)? We have a governmental approval for a natural ventilation in the UP. The excess pressure from the building to the UP is 5Pa and the distance of the shafts to the building is according to the LEED requirements.
Is it possible to achieve points in this credit?
Thank you!

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Sep 01 2012 LEEDuser Moderator

Jens, I am not sure what part of this credit you're concerned about? I don't see anything in this credit that precludes your approach.

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GABRIEL MORALES Architect Grupo Syasa
Jun 27 2012
LEEDuser Member
580 Thumbs Up

Entryways system disntance 10ft

Hello,
architecture according to our main lobby, meeting with the distance of 10ft mat we complicated for users coming from the parking lots.

The design team has proposed installing a section of entryways system (4ft) in the booth in the lobby elevators and install (6ft), prior to access the offices.

LEED is it valid for this proposal?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Jul 13 2012 LEEDuser Moderator

Gabriel, I think you can make a case for this in your narrative,  or by getting 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, but I'm not sure it will work. We have heard about split entryways being accepted when split between inside and outside the main entry door, but this is a variation I haven't heard before. Again, I think it could work but only GBCI can say for sure.

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myriam tschiptschin CTE
Feb 22 2012
Guest
48 Thumbs Up

Walk-off mat system - Stone panels with a recess below.

The project team of an office building is interested in using a new product called C/S Floorometry® 401 for the walk off mat: http: //www.c-sgroup.com/files/literature/Floorometry_0.pdf
This is a flooring system composed of stone panels with a built-in drainage device that allows dirt and water to fall through to a recess below. It incorporates an anti-slip surface coating and its roughness can be improved with additional serrations. The modules can be removed to clean the recess below.

In the product catalogue it is written “LEED® IEQ Credit 5 Contribution (Pollutant Source Control) – Yes” but this kind of system is not mentioned in the reference guide. For this reason, the project team would like to know if this system meets the IEQc5 credit requirements as described in the product information.

Thanks in advance.

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Sep 01 2012 LEEDuser Moderator

Myriam, referencing to the credit language (see above), a slotted, cleanable system like the one you describe should be allowable, in my opinion.

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PAULA HERNANDEZ MRS. INGENIERO MARIO PEDRO HERNANDEZ
Dec 04 2011
LEEDuser Member
535 Thumbs Up

MERV 13 filters

The Guide asks for MERVMinimum efficiency reporting value. 13 filters for all return and outside air ...does it mean, for instance in a VRF air conditioning system or in a fan coil system, that each evaporator or each fan coil should count with a MERV 13 filter?, this would be crazy for both things, first, the great cost of a medium installation, and second, because of the great pressure drop through these kind of equipment which do not have a great injection pressure capacity.

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Dylan Connelly Mechanical Engineer, Integral Group Dec 06 2011 LEEDuser Expert 6798 Thumbs Up

There is new legislation on the subject. Here is a link to the "LEED Addenda" website.
http://www.usgbc.org/DisplayPage.aspx?CMSPageID=2200#BD+C
Because this is new legislation I can only give you my interpretation:
The intention of the correction is to clarify where the MERVMinimum efficiency reporting value. 13 filters should be located inside an 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. that supplies OSA and recirculate air. The filter should not be at the OSA damper, but instead downstream of the mixing of the return air and the OSA to filter both the OSA and recirculated air.
However, an indoor fan coiling unit or heat pumpA type of heating and/or cooling equipment that draws heat into a building from outside and, during the cooling season, ejects heat from the building to the outside. Heat pumps are vapor-compression refrigeration systems whose indoor/outdoor coils are used reversibly as condensers or evaporators, depending on the need for heating or cooling. In the 2003 CBECS, specific information was collected on whether the heat pump system was a packaged unit, residential-type split system, or individual room heat pump, and whether the heat pump was air source, ground source, or water source. that is recirculating air to condition a space would not require MERV 13 if it is not pulling air directly from outside. Even if there is a DOAS providing OSA air into a mixing boxing in the back of the FCU/heat pump, it should still not require a MERV 13 filter (only MERV 8 for ASHRAE). The MERV 13 filter would be in the DOAS.
The legislation was changed in the first place because FCU's can't handle the pressure drop from a MERV 13 filter - I don't believe this legislation was intended to put that requirement back.

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Nándor Kovács
Aug 01 2011
Guest
105 Thumbs Up

vestibule instead of pressure difference

I found in ASHRAE 62.1-2004 standard that using a vestibule to provide airlock between garage and regulary occupied spacesOccupied Spaces are defined as enclosed spaces that can accommodate human activities. Occupied spaces are further classified as regularly occupied or non-regularly occupied spaces based on the duration of the occupancy, individual or multi-occupant based on the quantity of occupants, and densely or non-densely occupied spaces based upon the concentration of occupants in the space. is a compilant way to limit the entry of exhaust gases.

Is it possible to achieve this credit that way?

For example: There's no direct connection between the garage and the office space in our recent project (i.e. it's on a different level underground connected with staircase and lifts).

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 21 2011 LEEDuser Moderator

Nandor, I don't think this would be LEED-compliant. There is likely to be some air movement from the garage to the building unless there is negative pressure.

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Omar Katanani
Jun 21 2011
LEEDuser Member
7525 Thumbs Up

Negative Pressure Differential Requirement

Dear all,

One of the credit requirements is that:
"The pressure differential with the surrounding spaces must be at least
5 Pa on average and 1 Pa at a minimum when the doors to the rooms are closed."

This was deemed a bit vague by the mechanical engineer: He claimed that if the exhaust system is designed for a differential of at least 5 Pa, then why worry about the 1 Pa?

Can someone please clarify the distinction between both numbers, and what's the proper way of designing the system to achieve the requirement?

Many thanks!

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Jul 15 2011 LEEDuser Expert 6055 Thumbs Up

George- I am not an engineer, so I don't have the full technical answer for you, but the 5 Pa average takes into account the room door being open, while the calculation allows you to drop to a less stringent 1 Pa when the door is closed and contamination is less likely.

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Rubén Morón Rojas Codirector CIVITA
Apr 04 2011
LEEDuser Member
824 Thumbs Up

Exhaust requirement in C&S Building

We have a C&S building and we asume that it will be occupied by corporate offices. What do we need to do about the exhaust requirement?

Above says :Core-and-Shell (CS) projects must meet all the relevant credit requirements for the CS scope of the building, including work done as part of the base building in future tenant spaces.
What does that mean? Do we have to leave exhaust ducts for the tenats?

Or do we have to include the requirements in the tenat lease agreement?
What is the definition from high volume copy equipment?

Thanks

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Apr 22 2011 LEEDuser Moderator

A high volume copy area is 40,000 copies or more per month.

According to CS Appendix 4, IEQc5 must be supported by tenant lease agreements.

I would meet the credit requirements for any space you are building out, make it physically possible for the tenant to meet all requirements, and require them to do so in the lease.

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Rubén Morón Rojas Codirector, CIVITA Apr 25 2011 LEEDuser Member 824 Thumbs Up

About this issue the GBCI technical customer service answered:

"...the requirements of a credit exclude the fit-out of tenant spaces. Tenant space activities such as use of copiers, fax machines, and printers are not considered within the scope of the LEED Core & Shell program."

So, Do we have to leave exhaust ducts for the tenats?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Apr 26 2011 LEEDuser Moderator

I don't really know what to make of GBCI's response. It doesn't address the key questions, which are a) tenant lease requirements, and b) including systems enabling tenants to meet credit requirements. I shared my thoughts on both topics earlier. I'll ask around for another opinion.

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Apr 27 2011 LEEDuser Expert 6055 Thumbs Up

In the past, I have been successful providing any required exhaust in core spaces, making sure the mechanical systems are capable of allowing tenants to provide any required exhaust in their space and also writing the exhaust requirements into the tenant lease agreement. Of course, past acceptance doesn't gurantee ot for the future, but I think that you should be in good shape if you do these three things.

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V Miller WSP
Feb 24 2011
Guest
568 Thumbs Up

Cleaning contract for roll out mats

LEED User credit checklists for this credit indicate that a copy of the cleaning contract must be provided. However, the roll out mat section of the tempalte does not have an upload button, or ask to provide a copy of the cleaning contract. There is only a box to provide a narrative description of floor mats, mat type(s) and locations, and description of the maintenance procedure. In my expereince on previous projects, a letter from the owner was required by the USGBC.

1. Is it necesary to provide a copy of the contract in version 3/2009?
2. If contract is required, where does one upload the contract?
3. Can a letter from the owner be provided instead of the contract as long as it contains all the pertinent information?

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Feb 24 2011 LEEDuser Expert 6055 Thumbs Up

We have achieved this credit on a couple 2009 projects by just writing a good narrative and not providing additional supporting documentation. Of course, reviews vary a little from project to project, so that doesn't necessarily mean you won't need additional information. If I were you, I would submit with only a narrative and worry about additional documentation only if the credit is marked for clarification sduring the review.

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Christine Teichert
Feb 01 2011
Guest
296 Thumbs Up

walk-off mats

We are about to submit for our desgin review and are wondering if exits used soley for egress and accesibility only can be exempt from the need for a walk-off mat. We are showing walk-off mats in our revolving doors and extending inside from the revolving doors to total 10ft, but we do not want to provide mats for the doors adjacent to the revolvers since there will be signage that reads, "please use revolving doors". This will drastically decrease the amount of use, therefore, we feel that these would not qualify as regularly used exterior entrances.

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Thorn Grafton Feb 01 2011 Guest 241 Thumbs Up

It sounds like you are stretching it. I would take the regular doors with or without the sign directing me to use the revolving doors. Not wanting to do something that is a requirement is obviously not a convincing argument. If you could make an operational argument that, despite the number of doors required for egress by life safety codes, entering is always controlled by building management in a certain way (ie. "No Entry" on certain doors), then you might be onto something.

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Feb 01 2011 LEEDuser Moderator

I see this often on buildings—signs directing you to use the revolving door, or just somehow people using the revolving door more often—but the secondary door still gets plenty of use. You'd have to truly limit use of this door to make this strategy work. Locking it might accomplish that, but that's counter to the need for egress and accessibility.

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Feb 02 2011 LEEDuser Expert 6055 Thumbs Up

I agree with Tristan and Thorn- you';re going to have to provide entryway systems for these doors because they will get used on a regular basis.

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Tommy Sinclair Designer, HOK Jul 12 2013 LEEDuser Member 17 Thumbs Up

How does one meet this criteria when a revolving door is being used? Do I need to locate a walk off mat outside of the revolving door assembly? Or try to design a grill system within the assembly?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Jul 17 2013 LEEDuser Moderator

Tommy, it's up to you as the designer. A grille system could be in the assembly, but it's more likely to have it before or after the door.

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Petr Lhoták Sustainability Consultant Skanska Czech Republic
Jan 24 2011
Guest
1656 Thumbs Up

Permanent entryway system in underground garage?

We are planning a commercial building with 2 floors of garage spaces under the building. These floors will be accessible via entryway for automobiles and two cores with elevators and staircases for building users. Elevators and staircases go directly to every floor above ground into open space offices. Of course, the building has it's main entrance in the ground floor.
My question is: Do we have to design permamanent entrway systems in front of the elevator entrances in every floor of the garage?
The problem is, that if we put a 10ft mat in front of the elevator door, it crosses traffic lanes. Does anybody have a similar experience?

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Jan 24 2011 LEEDuser Expert 6055 Thumbs Up

Petr- you will need 10ft of entryway system in front of the elevators. Perhaps there is some sort of heavy grate system that be used where it crosses the traffic lanes.

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Thorn Grafton Feb 01 2011 Guest 241 Thumbs Up

Petr - if you can't manipulate the primary direction of travel to be out of the vehicle lane, perhaps try an alternate compliance path where 5' or 6' is outside, and an open grid mat on the floor of the elevator serves as the balance. Elevator floors always need frequent cleaning anyway. Has anyone else tried something like this?

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Prudence Ferreira Principal Integral Impact
Nov 08 2010
Guest
836 Thumbs Up

Green Cleaning Program

If our project pursues a green cleaningGreen cleaning is the use of cleaning products and practices that have lower environmental impacts and more positive indoor air quality impacts than conventional products and practices. program ID credit, would that in any way ease our hazardous storage requirements for IEQ 5: Indoor Pollutant and Source Control? Particularly, do we still need the proper storage for hazardous cleaning materials if we are not using any in the building?

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Nov 12 2010 LEEDuser Moderator

The credit requirements have to do with providing suffcient ventilation of spaces where hazardous materials may be stored. If no such materials are stored in the project building then no, you don't have to meet that requirement.

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John Albrecht Director of LEED Services, Sieben Energy Assoc. Dec 10 2010 Guest 2143 Thumbs Up

Tristan, this 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 seems to say otherwise:

"2/7/2005 - Ruling
....Green housekeeping products still contain chemicals which need to be contained and dealt with per the credit requirements (albeit at lower levels). Therefore, even if the project only uses Green Seal compliant cleaning products, it would still need to meet the criteria of providing the ventilation requirements and deck-to-deck partitions. This is also noted in the CIR ruling dated 1/24/2005 which states that ôGreen housekeeping cleaners contain chemicals that need to be addressed.ö This credit does NOT differentiate between rooms that store Green-Seal-compliant cleaning products and those that store industry standard products.

The need for drains plumbed for appropriate disposal of liquid waste is a separate issue from the ventilation requirements. As noted in CIR ruling dated 2/18/2002, sinks that dispose of chemicals, such as detergents, which are approved by the local water treatment facility, can be part of a conventional sanitary drainage system. If greywater is being directed to re-use for irrigation or uses or to a natural wastewater treatment system, then separate plumbing would be required for disposal of conventional cleaning agents. Projects should check with their local treatment facilities to confirm what the jurisdiction requirements are for chemical disposal.

In response to the question raised in CIR ruling dated "1/18/2005, a project MAY be able to meet this requirement by only providing permanent walkoff mats and entryway systems if NO chemicals (of any type) are mixed and stored on-site. If any chemicals are mixed or stored on-site, then the criteria for containment, ventilation and plumbing will apply. " Or am I missing something? Thanks, John

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Allison Beer McKenzie Architect, Director of Sustainability, SHP Leading Design Dec 12 2010 LEEDuser Expert 6055 Thumbs Up

I have gotten a response on a past project that walls must be floor go deck and the ventilation requirements met even if green cleaningGreen cleaning is the use of cleaning products and practices that have lower environmental impacts and more positive indoor air quality impacts than conventional products and practices. products are used, so I would encourage you to go ahead and follow the stated credit requirements.

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Omar Katanani
Sep 23 2010
LEEDuser Member
7525 Thumbs Up

Permanent entryways on the roof

Dear all,

Our project is a big mall, with the roof being utilized as restaurants, play area, a cinema complex, a green vegetated area, and some technical areas.

Accordingly, this area will be maintained and cleaned on a daily basis. In addition, the roof will be accessed from the floor below only, and hence can confidently be considered as a space within the mall with no connections to the outside.

My question is: Can we exclude the roof entrances from the "Indoor Chemical & Pollutant Source Control" credit? It is not physically feasible to install permanent entryway systems on the entrances between the open roof and the closed mall portion (cinema complex & escalator's lobby).

I believe that we can exclude permanent entryways. Any suggestions?

Many thanks!

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Sep 24 2010 LEEDuser Moderator

I would say this is a gray area and it will be up to you to make your best argument to the reviewers that you shouldn't have to include entryway mats there.

It is outdoor space, and subject to dust, sand, pollen, animal incursion, and other things that create "pollutants" in outdoor spaces.

Think of it this way—would LEED allow you to skip the entryway for the front door just because your staff sweep the sidewalk once per day? I very much doubt it.

That said, I do think you have a point and could argue it, it's just by no means a sure thing.

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