Hello everyone,

I hope everyone is safe and sound during this time of crisis. 

Is there a provision which allows to use ASHRAE 62.2 2010 in lieu of ASHRAE 62.1 2010 to meet exhaust/ventilation requirement in dwelling units for LEED BD+C NC projects? 

Following continuous exhaust rates are defined as per ASHRAE 62.1 2010 vs ASHRAE 62.2 2010 in a dwelling unit:

Bathroom - 25 cfm vs 20 cfm

Kitchen - 50 cfm vs 5ach

Our project is in New York City and as per mechanical code in NYC, when exhaust in dwelling unit increases above 75 cfm, mechanical ventilation is a mandatory requirement. With ASHRAE 62.1 2010 any dwelling unit with two bathrooms or more will automatically require mechanical ventilation. Whereas, ASHRAE 62.2 2010 can accomodate two bathrooms since kitchen exhaust generally range in 25-30 cfm (when calculated as 5 ach). The kitchen area in NYC buildings are fairly small and 50 cfm as per 62.1 2010 seems overkill anyway. Please provide guidance if ASHRAE 62.2 2010 exhaust requirement can be used for dwelling units when project is following LEED BD+C.

Thank you.

Rahil Shah