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NC-2009 IEQp1:Minimum IAQ Performance

Exhaust Requeriments with Natural Ventilation

hi all, Can you meet the prerequisite using paragraph 5.1 (Natural ventilation) from Standard 62.1-2007 for areas that require exhaust system (i.e. toilets, kitchens, etc.)? Thanks!

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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Mon, 07/29/2013 - 22:14

Hi- I don't see why not. The prerequisite does not address the required exhaust, but just the required outdoor air supply (whether natural or mechanical).
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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Mon, 07/29/2013 - 22:28

I've contacted both gbci and ASHRAE on this and they both confirmed that section 5.1 does not substitute exhaust requirements. Section 5.1 substitutes OA supply only.
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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Tue, 07/30/2013 - 14:47

You may find Andrew Mitchell, P.E.'s response from a question about kitchen exhaust below helpful: "per LEED CIR 10248, any mechanically ventilated kitchen must meet the exhaust requirements of ASHRAE 62.1 Table 6-4 (exhausted to the outside). Naturally ventilated kitchens do not require exhaust tot he outdoors. Please see the ruling language here: http://www.usgbc.org/leed-interpretations?keys=10248"
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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Tue, 07/30/2013 - 15:00

Also, I suppose I should qualify my statement above that "the prerequisite does not address the required exhaust". Actually, while the LEED credit form does not require specific exhaust data or calculations, mechanically ventilated spaces do have to comply with ASHRAE 62.1-2007 section 6, which includes required exhaust.

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