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:
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.
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.
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.
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.
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.
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.
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.
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.
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.
LEED Interpretation #5266 made on 05/30/2007 states that the requirements are applicable only to entrances from the outdoors.
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.
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.
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.
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.
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:
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.
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:
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:
Locate hazardous waste storage containers away from outdoor air intakes.
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:
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.
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.
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.
Excerpted from LEED 2009 for Core and Shell Development
To minimize building occupant exposure to potentially hazardous particulates and chemical pollutants.
Design to minimize and control the entry of pollutants into buildings and later cross-contamination of regularly occupied areas through the following 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.
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.
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.
The Janitorial Products Pollution Prevention Project is a governmental and nonprofit project that provides fact sheets, tools, and links.
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."
Environmental Building News feature article describing the benefits and design choices for entryway walk-off systems.
Environmental Building News feature article explaining the various types of air filters, how their performance is measured, and ways to optimize their effectiveness.
Facilitiesnet article covering the basics of air filtration, drawbacks and benefits, standard practices and basic concepts.
Table of filtration efficiencies and their subsequent filtration properties and common applications. Good background on MERVMinimum efficiency reporting value. 13 filtration.
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.
The following links take you to the public, informational versions of the dynamic LEED Online forms for each CS-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."
Documentation for this credit can be part of a Design Phase submittal.
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
If you are continuously exhausting the space during occupied hours - your average and minimum are the same.
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...
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.
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
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.
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.
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?
How do I calculate the pressure differential between the carpark lift lobby when the carpark is naturally ventilated?
Call the car park neutral. Pressurize the adjacent lobby.
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?
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.
Can this be achieved if the cleaner's cupboard and the toilets share the same extract system?
Yes, the systems can be combine as long as they don't recirculate back into the building supply
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.
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?
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.
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?
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.
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?
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.
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.
Julie, I would almost certainly include that space/entrance. I don't think "regularly used" has to be defined as "daily."
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?
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.
Does the MER13 need to be requested to future tenants by a leasing agreement?
Michael, see CS Appendix 4 in the LEED BD&C Reference Guide. The answer you'll find there is.... yes.
Thank you Tristan!!
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.
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?
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.
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?
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.
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.
Myriam, referencing to the credit language (see above), a slotted, cleanable system like the one you describe should be allowable, in my opinion.
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.
There is new legislation on the subject. Here is a link to the "LEED Addenda" website.
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.
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).
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.
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?
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.
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?
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.
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?
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.
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.
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?
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.
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.
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.
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.
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.
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?
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.
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?
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.
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?
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?
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.
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
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.
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?
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.
Your graphic above says the walk-off mats are 6' long, but the text here, and the LEED text, says the walk-off mats must be 10' long. Just checking.
Yes, the graphic is intended to illustrate the type of documentation to provide. The actual requirement changed from 6 feet to 10 feet with the introduction of LEED 2009.
Can the 10 foot requirement be split up so that 3 feet are outside the buikding and 7 feet are inside, all 10 feet in the direction of travel? Even though not entirely within the building, keeping some of the mud, snow, and dirt outside the building altogether would seem to satisfy the credit's intent of minimizing "building occupant exposure to potentially hazardous particulates and chemical pollutants." Thoughts? Thanks in advance, John
An old 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 concur that an exterior matt could comply with EQc5 intent--agreed?
"10/7/2004 - Credit Interpretation Request
I am running into two interpretations for the location of the "permanent entryway system." One argues that the system should be outside the entry door so pollutants are scaped off and left outside the enclosed indoor space. The other argues that the system should be inside the entry because a mat outside could get wet and muddy thereby adding to the dirt and contaminants brought inside. Research on the issue has not revealed which is satisfying the intent of this point. i look forward to your interpretation.
11/1/2004 - Ruling
The intent of EQc5 is to prevent contaminants from entering the building which could have an effect on the indoor air quality. However, the location of the ôpermanent entryway systemö, for example grills and grates, is subjective, depending on the layout of the building. If there is a vestibule it may be appropriate to have a walk off area located within it. Also, exterior walk-off areas may be considered if the area is protected from weather. Alternatively, the walk-off area can be within the building. "
John, I think there is a consensus on LEEDuser (see the NC IEQc5 forum, if I remember right) that you can hat a mat that's at least partially outdoors if it's weather protected. Or it could be broken up in other ways, too, if there is 10 feet in the direction of travel.
Tristana, I agree with your concensus, thanks, but I just found the 2009 BD&c Ref Guide p. 513 (item 4, 4th para. under Implementation) says: 'Entryway systems must extend 10 feet from the building entrance into the building interior'. This sentence was not in V2.0, 2.1, or 2.2, and it seems to trump the 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 about an exterior system. Might this question need to be elevated to a CIR? Thanks again (and sorry I missed you at Greenbuild), John
Has anyone tried a partially indoor partially outdoor mat in 2009? This new phrasing does seem to trump previous CIRs and rulings, so I would be very cautious about trying the half and half method in 2009 without a CIR.
Architect, Director of Sustainability
SHP Leading Design
Specifying and sizing equipment with MERV 13 filters affects both these credits.
MERV 13 filters will increase fan energy demand as higher filtration ratings increase resistance to airflow and therefore slightly increase your energy demand.
Mechanical systems components will need to be commissioned to confirm appropriate installation of filtration media.
Additional mechanical system capacity may help meet the requirements of IEQp1. Ventilation systems must have MERV 13 filtration on all supply air.
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