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NC-v4 EQp1:Minimum indoor air quality performance

Exhaust Requirement for Dwelling Units in LEED BD+C (ASHRAE 62.1 2010 vs ASHRAE 62.2 2010)

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Rahil Shah
Director of Sustainability
Ventrop Engineering Consulting Group PLLC
LEEDuser Premium Member
2 thumbs up

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

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James Keohane
Sustainability and Commissioning Consultant
Sustainable Engineering Concepts, LLC
LEEDuser Basic Member
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Mon, 04/27/2020 - 17:48

Excellent question!  I am working on a mixed use project that is LEED v4/4.1 NC.  I will watch for responses.  Thank You for asking this question!

Mon, 04/27/2020 - 18:21

In 4.1 all residential projects are broken out in a separate rating system. If you follow 4.1 you end up with LEED Multi-family Residential, which uses ASHRAE 62.2-2016. 
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Rahil Shah
Director of Sustainability
Ventrop Engineering Consulting Group PLLC
LEEDuser Premium Member
2 thumbs up

Mon, 04/27/2020 - 18:34

Thank you Christopher for a quick response. I just read forward in ASHRAE 62.1-2016 and you are absolutely correct. It reads that "Previously, Standard 62.1 had responsibility for multi-family residential buildings that are 4 stories or more. Now the dwelling units themselves are covered by Standard 62.2 regardless of building height, while common areas are covered by 62.1.".    This means that since LEED is allowing to substitute v4.1 prerequisite/credits on BD+C & ID+C projects, I will be able to substitute EQp1 of v4 with v4.1 and design minimum exhaust/ventilation in dwelling units as per ASHRAE 62.2-2016 and rest of the common areas as per ASHRAE 62.1-2016.    Please correct me if my interpretation is wrong here. And James, I believe this shall help you as well with your NC project. Good luck!   Regards,   Rahil Shah

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