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NC-2009 IEQp1:Minimum IAQ Performance

Toilet Exhaust with Exhausted Air to Storage

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Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Hi, I'm working on a project for a deposit. On site there is a large exhaust fan on the roof. This deposit have a small bathroom with mechanical exhaust however, is not possible to have this air outside due to the type of envelopment site. Can I exhaust this air into the deposit so that the exhaust fan of roof send outside? That would be a mixed ventilation? Thanks.

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Fri, 02/07/2014 - 13:01

It sounds like your "deposit space" is going to be either class1 or 2 air. In that case, you cannot exhaust Class 2 (bathroom) air into it. See ASHRAE 62.1-2007 paragraph 5.17.3.2.
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Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Fri, 02/07/2014 - 13:15

But I if I consider that my storage is class 4, as shown in Table 6-4? In this case I can transfer air to the storage, and the exhaust fan of storage releases this air to the outside. Correct? Thanks

Fri, 02/07/2014 - 13:19

Is it a chemical storage space?
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Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Fri, 02/07/2014 - 13:28

We don't have this information. The client does not know yet. The storage is very large. The bathroom is very small in relation to storage. Maybe with a narrative explaining you think would work?

Fri, 02/07/2014 - 13:31

In my opinion, you should duct the bathroom exhaust to the outdoors. It is up to you how you want to document your design but I would personally never err on the side of a code deficiency just to allow a LEED prerequisite to be achieved a little bit easier. Unless you know that it will be Class 4 storage then this is the only advice I can give you.
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Marina Andrade
Sustainability Consultancy Services
Cushman & Wakefield
LEEDuser Basic Member
11 thumbs up

Fri, 02/07/2014 - 13:33

Ok, thanks for this advice Andrew.

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