Hello, One of the LEED requirements of this credit is: "[For rooms with chemicals / hazardous gases], the exhaust rate must be at least 0.50 CFM per sq. ft. with no air recirculation." A photocopy room (or a garbage room) will have a dedicated fresh air duct and another dedicated exhaust air duct, and the exhaust rate requirement will be met (0.5 CFM/ft2). I was wondering if such rooms can also be cooled by an HVAC system (ex. DX Split Unit) which fully recirculate the air inside. The intent of the credit is met since the HVAC system only serves this room, and the pollutants will not move to any adjacent space. Can this be possible? Thanks!

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Tristan Roberts

Representative

Vermont House of Representatives

LEEDuser Expert

7780 thumbs up

Thu, 05/30/2013 - 15:32

Omar, I don't see any problem with that.

Tracy Black

Professional Engineering Consultant

Engineered Solutions

LEEDuser Basic Member

0 thumbs up

Wed, 08/28/2013 - 00:50

If memory serves... I believe that most AHJ's (outside of LEED) will give you some grief about no OA in the copy room. The reason being that people are still in the copy room for more than a few seconds. Additionally, high speed line printers these days do not generate a significant amount of ozone (O3-). The exhaust rate must exceed any leakage, i.e. the copy room should be a slight vacuum.

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