Entry Type ID Date Applicable Rating System Primary Credit Inquiry (LIs) Ruling (LIs) Related Addenda/LIs Related Resources Campus Applicable Internationally Applicable Country Applicability Reference Guide (Addenda) Page (Addenda) Location (Addenda) Description of Change (Addenda) "LEED Interpretation" "1795" "2007-08-08" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "EQc5 - Indoor chemical & pollutant source control" "Our project is a 7 story 163,000 sq. ft. laboratory/vivarium building that is mechanically ventilated with MERV 13 filtration for all air handling units serving the building. Among various other programmed areas, the building has 21 zones of open laboratory spaces that are being MERV 13 filtered, heated, and cooled by the laboratory air handling unit system. To minimize the excessive requirements of outside air into the building for these labs, supplemental recirculated fan coil units are being provided for these 21 zones. The systems (at minimum load conditions) start out by ventilating these labs with 6 ACH (air changes per hour). Upon an increase in load, the VAV (variable air volume) air system will increase the ventilation to these zones to a maximum condition that corresponds to 12 ACH. Upon further need for cooling (based on excessive summer heat through the exterior glazing to these zones), there are 21 individual fan coil units that provide additional cooling to these spaces to satisfy the local temperature sensors. The 12 ACH still comes from the MERV 13 filtered air handling unit systems but the fan coil units are only MERV 8 filtered. The intent for these supplemental systems was to minimize the energy consumption for these transient conditions by not utilizing additional outside air. Since these units fully recirculate their air flows from within these 21 laboratory zones and only activate upon excessive cooling conditions to supplement the flows from the MERV 13 air handling units, does this ventilation scheme meet the intent of EQ credit 5: Indoor Chemical & Pollutant Source Control?" "The CIR inquiry indicates that the project receives 100% of its outside air through air handling units that are equipped with MERV 13 filtration, as required by EQc5. Additional fan coil units equipped with MERV 8 filters are located within the building to provide supplemental cooling for 21 zones during maximum load conditions. The supplemental fan coil units supply air is made up of a mixture of filtered outside air from the air handling units that are equipped with MERV 13 filters and from recirculated air within the conditioned zones. Since the fan coil units recirculate room air, they must have MERV 13 filters. Therefore, the design, as described, does not appear to meet the intent of the credit. NOTE: UPDATED CREDIT LANGUAGE FOR 2009 STATES THAT ""PARTICLE FILTERS OF AIR CLEANING DEVICES SHALL BE PROVIDED TO CLEAN THE OUTDOOR AIR AT ANY LOCATION PRIOR TO ITS INTRODUCTION TO OCCUPIED SPACES"". REQUIREMENT FOR FILTRATION ON RETURN AIR IS NO LONGER APPLICABLE TO ANY VERSION OF ANY RATING SYSTEM." "None" "None" "LEED Interpretation" "5129" "2008-07-02" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "EQc5 - Indoor chemical & pollutant source control" "Are data centers and telecom rooms considered non-regularly occupied rooms for the purposes of EQ5? This Credit Interpretation Request is in reference to a 92,000 square foot office building and research laboratory that includes a 5000 square foot data center. As part of the credit, we are required to provide air filtration with a Minimum Efficiency Reporting Value (MERV) of 13 or better for all supply air serving regularly occupied spaces. The 5000 sqft data center and associated telecom rooms house data equipment and power distribution equipment. The data center does not include support areas, offices, cubicles, chairs, desks, etc. We are proposing to air condition the data center with floor mounted computer room air conditioning units. These air conditioning units are typically not furnished with MERV 13 filtration. The Reference Manual does not clearly define \'regularly occupied spaces\' in the chapter on \'Indoor Chemical & Pollutant Source Control\'. Regularly occupied spaces are defined in the chapter on \'Day Light and Views\', EQ Credit 8.1. The definitions at the end of this chapter define regularly occupied spaces as where workers are seated or standing as they work inside a building. Non-regularly occupied spaces include corridors, hallways, lobbies, storage rooms, kitchens, restrooms, stairwells, etc. Non-occupied spaces include rooms used by maintenance personnel that are not open for use by occupants. Non-occupied spaces include janitorial, storage and equipment rooms. We believe that this data center and the telecom rooms are equipment type rooms and are not regularly occupied. There are not any seats or desks in the data center. The data center is used by personnel for computer maintenance and upgrades. Kitchens, copy rooms, and break rooms are in the non-regularly occupied category. These rooms are used more extensively than the data center. Please confirm that MERV 13 filters are not required for air-conditioning units serving the data center and telecom rooms and that this approach will meet the requirements of EQ Credit 5." "Can a data center that does not include any support areas, offices, cubicles, chairs, or desks be considered a non-regularly occupied space for the purpose of EQc5 calculations? Yes, as described this space is not intended to house any people during an average workday and may be considered a non-regularly occupied space. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "5189" "2009-04-09" "New Construction, Core and Shell, Schools - New Construction, Commercial Interiors, Existing Buildings" "EQc5 - Indoor chemical and pollutant source control" "The project to which this CIR pertains is a vocational school for high school-aged students. Within this building there are science labs. The two science laboratory classrooms share one preparation room. Each of the three spaces is served by a dedicated heat pump. Each space is also exhausted, per the requirements of the Ohio School Facilities Commission\'s 2008 Ohio School Design Manual. We are writing this CIR to confirm that our design approach meets the intent of Indoor Environmental Quality Credit 5, Indoor Pollutant and Chemical Source Control. In the heat pump systems, as designed, each room has it\'s own dedicated heat pump. This unit takes air from the dedicated space only, mixes it with fresh air from a dedicated outside air unit, heats or cools it accordingly and supplies it back to the space. In keeping with the EQc5 requirements, each of these units is to be provided with MERV 13 filtration that will handle both the air from the space and the fresh air. No air is sent to another space, nor is any air brought to the science labs from another space by the HVAC system. The supply and exhaust air rates have been balanced to maintain the proper negative pressurization of each space as per EQc5. The preparation room will be negative relative to the adjacent corridor and two science labs. The exhaust systems are ducted directly to the outside through the building roof. Architecturally, each room will feature deck-to-deck partitions and self-closing doors, as required. The Credit Requirements state that no air must be recirculated. We believe the intent of this statement is to prohibit recirculating air between rooms, which we have eliminated with our design. The Heat Pump only uses air from the room it serves and fresh air provided via direct ducting. No air from this space will travel to another space within the building. In addition, the supply air volume, by design, shall remain less than the exhaust air volume to maintain the required negative pressurization. Further more, we consider the air in a K-12 classroom laboratory to be Class 2 air per ASHRAE 62.1-2004. According to Section 5.17.3.2 Class 2 Air: ""may be recirculated within the space of origin."" Therefore, we believe the HVAC system as described above meets the intent and requirements of LEED for Schools EQc5. We also believe the same to be true for fan-powered VAV boxes, classroom unit ventilators and in-room fan coil units." "The applicant is requesting clarification regarding recirculation of air in science labs. Ventilation systems may recirculate air within isolated spaces where chemicals may be present or used, provided that air is not recirculated to other spaces and that both the outside air and return air are filtered by filtration media with a MERV rating of 13 or greater. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "5225" "2009-05-20" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "EQc5 - Indoor chemical & pollutant source control" "This CIR references the provisions for appropriate air filtration media for an office and warehouse distribution facility, as per EQc5. The intent of this credit is to minimize exposure of occupants to potentially hazardous particulates and chemical pollutants. We have accomplished this by traditional means in the office areas by: 1. Employing permanent entryway systems, 2. Exhausting areas with hazardous gases or chemicals sufficiently, 3. Providing proper filtration media: a. The main and warehouse offices will have MERV-8 pre-filters and MERV-13 final filters. b. Green cleaning strategies have been employed throughout the building. As stated on the USGBC website, ""LEED for New Construction and Major Renovations is a green building rating system that was designed to guide and distinguish high-performance commercial and institutional projects, with a focus on office buildings. Recognizing that the warehouse is a ""LEED challenged building type"" and clearly and systematically differentiates from commercial office buildings, there have not been any specific requirements developed to consider this building type. Therefore, to design for minimizing exposure of occupants to potentially hazardous particulates and chemical pollutants in this building type, we referenced ASHRAE Standard 52.2-1999 that provides specifics to warehouse efficiency requirements. The following recommendations were implemented: 1. Selecting the highest recommended filter efficiency for warehouses (MERV-8) based on ASHRAE Standard 52.2-1999. a. ASHRAE recommends 10% (MERV-1) to 35% composite average particle size efficiency for warehouses (MERV-8). b. Typical applications for MERV-13 filtration according to ASHRAE are for high end Commercial Office buildings and healthcare areas such as surgical suites/operating rooms. Based on following ASHRAE\'s requirements, MERV-8 filtration (35%) is considered high end for warehouses. 2. Green cleaning strategies will be employed throughout the building. 3. Trucks are not permitted to idle. 4. No propane fork trucks are permitted or combustion vehicles in the interior. Although we have been awarded this credit for several of our projects using MERV-8 filters in warehouse buildings we wanted to clarify it for other design teams." "The applicant is asking if the warehouse spaces of the project can be exempted from the MERV-13 filtration requirement of this credit. No, based on previous LEED NC 2.2 CIRs, dated 8/13/2008 and 2/12/2008, all air (ventilation and return air) supplied to occupied areas of the building must pass through MERV-13 filtration and therefore the warehouse areas cannot be exempt from this credit requirement. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "5266" "2007-05-30" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "EQc5 - Indoor chemical and pollutant source control" "Background: Our project is a high rise building with street level entrances and below grade level building entrances from an inter-modal transportation hall, public transportation systems, and directly from other buildings. This inter-modal transportation hall includes an indoor shopping / amenity arcade, which connects a wide range of retail shops and public transportation (PATH, MTA). This inter-modal transportation network (which is not included in the scope of Tower One) will be a fully enclosed space with conditioned and filtered air, that will also be clean and maintained. The distance traveled from the closest outdoor entry point through the inter-modal transportation hall to the building concourse level entrance is over 500 feet Project Design Approach for Applying EQc5: The entire project design does meet and exceed the air filtration, partitioning, and exhaust requirements of EQc5. The street level entryways designs do have permanent walk off systems that meet the requirements in EQc5. Conclusion and CIR: The concourse entrances will be regular entry points to the building. The concourse entrances are accessed via a conditioned, filtered, clean indoor space and as such it is a significantly cleaner adjacent environment than the street. We are requesting confirmation of our interpretation that the concourse entrances are not ""entryways that are directly connected to the out doors"" as stated in the EQc5 requirement for the application of walk off systems." "The requirements of EQc5 apply only to entryways that are directly connected to the outdoors. The connection between concourses and interior space does not apply to the requirements of this credit. Applicable Internationally. " "None" "None" "X"