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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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 buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, etc. 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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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:
Projects in East Asia may use filtration media classified as high efficiency (高中效过滤器) or higher as defined by Chinese standard GB/T 14295-2008 (空气过滤器).
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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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.
Sample LEED Online forms for all rating systems and versions are available on the USGBC website.
Documentation for this credit can be part of a Design Phase submittal.
What is the LEED definition of Hazardous Gas or Chemical?
The credit language uses the example of a janitor's closet, but the project is pursuing 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. so there may or may not be hazardous chemicals in the janitor's closets. WIthout a definition or comprehensive list, how can the project determine what's hazardous and thereby requiring rooms with walls to deck and hard lids?
I am grateful if you can point me to a resource. Thanks.
I don't believe there is a specific definition in LEED. See the glossary entry below for some help. However certain items have always been considered relevant to this credit. Off the top of my head I can think of: cleaning supplies, car exhaust, large-volume printers, soiled utility rooms, labs, regulated chemicals. Anything that volatilizes and has a smell, pleasant or not, is a prime target; even if it a green chemical as in your case. When in doubt air it out. More specifically use source control liberally. Remember your objective is outstanding air quality.
hazardous material (from USGBC glossary)
any item or agent (biological, chemical, physical) that has the potential to cause harm to humans, animals, or the environment, either by itself or through interaction with other factors
On the particular "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." piece, we've had reviewers require hard lid ceiling and exhaust for janitors closets even if green cleaning is pursued. The logic given was that green cleaning policies set best practices but hazardous chemicals may still be used on occasion.
Our project is an office building where groundfloor is componed by retails and services dedicated to unknown tenants.
Taking into account that this is a CS certification, do we need to install entryway system in front of each retail shop ?
OR can we include it in the lease agreements in order to bind the future tenant to install it ?
Thanks for your help
If you can demonstrate that the provision in the lease agreement is binding, and that it meets all the specific credit requirements, it should be acceptable in my opinion. That said, the best option is a permanently installed entryway, which is likely part of the core & shell construction.
I am working on a project with a Full Fresh Air HVAC System i.e. No recirculation, while the toilet ventilation system is full extract to the atmosphere. On this basis, my question is can the filtration required (MERVMinimum Efficiency Reporting Value (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 13) be relaxed due to the Full Fresh Air System?
Full fresh air systems (also know as DOAS) are common and don't warrant an exemption to the MERVMinimum Efficiency Reporting Value (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 13 requirement. The goal of the MERV 13 requirement is that you clean the "fresh" outside air before it goes inside. You only have to have a MERV 8 if you were recirculating air.
We have a project where there is a sewage pit located on floor P2 of the parking garage. It's in a separate enclosed room and the question is whether or not it needs to be exhausted and included in calculations for EQc5.
Thanks for the help!
If it's within the LEED boundary, yes I would make it comply with EQc5. If the entire garage is already treated as an area to be separately exhausted with regards to this credit, then you could consider the sewage pit in the garage as part of the entire area rather than isolating it independently.
My project is an office building that will have entrance floor grills in its windage. But my question is: to have containious 10 feet floor grills the grills must continue inside to the building from the windage. The project would like to put tiles on each side of the door leading from the windage to the inside. This means that there will be scrapers, 1 fot clinker, then the grills will continuen. Do you think this will be approved by the reviewers despite grills are not continous?
I'm guessing that a windage is what I would call a vestibule. LEED Interpreation #10098 http://www.usgbc.org/leed-interpretations?keys=10098 may help, but you need to provide justification that your reviewer will accept.
I am working on a hangar ventilated naturally by a clerestory on the roof top. This project would be applicable to the credit IEQ.c5 ?
Interesting question. The intent of the credit is to prevent pollutants from entering 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.. If we consider the hangar to be a garage, then the hangar is the space with contaminants from which other spaces need to be protected. Therefore I would say the credit could apply if you can meet the separation and negative pressure requirements with the natural ventilation, and there are other occupied spaces in the building, i.e. a small office. If it just a big open hangar, then it probably doesn't meet the intent of the credit.
Does LEED require the copy/printers to be in a separate room with doors?
Only if they are high volume printers, i.e. 40,000 copies/month. Desktop printers can be located anywhere.
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?
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).
Due note that chiller rooms are considered hazardous by code. So consult your local code regarding continuous and purge exhaust for chiller rooms.
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.
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.
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.
I'd check in with the USGBC on this one - I've never heard of a good explanation for this question.
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?
How do we show that the printers/copiers to be installed are just convenience ones and therefore will not require separate exhaust?
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.
So your minimum is 3.3pa, and according to Dylan's guidance it will be the same as your average. If your average is only 3.3pa, how does it comply? Doesn't the average have to be at least 5pa?
I am working on a project with our janitor's closets being only 22s.f. The doors are standard with 1/8" gaps around the top and sides and a 1/4" gap on the bottom. Because of the small size of the closet, our average pressure differential is only getting to 1.1pa. Our Mech. engineer is confident we meet the intent of the credit but we do not meet the LEED blanket requirement.
Would appreciate if anyone can provide swift guidance!
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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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/GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC). 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 GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC). 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.
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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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 dropPressure drop is a decrease in pressure from one point in a pipe or tube to another point due to a restriction or length or diameter of the pipe or tube (resistance to flow). 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 (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. 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 dropPressure drop is a decrease in pressure from one point in a pipe or tube to another point due to a restriction or length or diameter of the pipe or tube (resistance to flow). 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 buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, etc. 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 GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC). 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 GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC).'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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