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" "2045" "2008-02-12" "New Construction, Core and Shell, Schools - New Construction, Commercial Interiors, Existing Buildings" "Our question regards the filtration requirement for re-circulating air systems, such as VAV terminals and fan coil units, under EQc5. Per LI 5061 and LI 1795 rulings, ""Since the fan coil units re-circulate room air, they must have MERV 13 filters"", so do the VAV terminal units that re-circulate air. This conflicts with our previous understanding that the MERV13 requirement would only apply to the air handling units supplying 100% outside air - or a mix of outside and return air - to a single or several rooms. The use of MERV 13 filters is justified when HVAC systems re-circulate a part of return air - e.g. mixed return air streams from various rooms - back to different spaces. In this configuration, supply ducts of the HVAC system and return air may become contaminated by re-circulated indoor-generated pollutants. Thus, contamination generated at specific indoor locations may be spread throughout the building unless properly filtered. However, the use of MERV 13 filters cannot be justified where air is re-circulated within the room. In this configuration, there is no possibility of cross-contamination: the re-circulated air has been conditioned and returned to the same room. In general, re-circulating air units (fan coils.) are provided with MERV 6 to MERV 8 filters. Using MERV 13 would substantially increase the energy consumption to condition a space without significantly improving the indoor air quality within the space. Imposing such a requirement would also cause most commercial systems to be ineligible for achievement of this credit, and may cause the other beneficial aspects of this credit (walk-off mats and isolation of harmful contaminants) not to be incorporated. Please clarify whether MERV 13 filtration is necessary for air re-circulated within a space." "**Updated January 1, 2014\n As noted in LI 5061 and LI 1795 rulings, both outside air and re-circulated air must pass through MERV-13 filtration before being introduced into a space, even if the re-circulated air is only being returned to the space it was drawn from. If there is a source of contamination in a space, filtering the re-circulated air before re-introducing it into the space provides a more rapid method of removing the contaminants than relying on the introduction of filtered outside air alone. 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 OR ANY RATING SYSTEM. " "None" "None" "X" "LEED Interpretation" "5266" "2007-05-30" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "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"