Toilet Exhaust with Exhausted Air to Storage

February 7, 2014

Marina Andrade

Sustainability Consultancy Services
Cushman & Wakefield

LEEDuser Basic Member

17 thumbs up

February 7, 2014

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.

Post a reply

Andrew Mitchell, P.E.

Principal
Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

126 thumbs up

February 7, 2014 - 8:01 am

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.

Marina Andrade

Sustainability Consultancy Services
Cushman & Wakefield

LEEDuser Basic Member

17 thumbs up

February 7, 2014 - 8:15 am

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

Andrew Mitchell, P.E.

Principal
Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

126 thumbs up

February 7, 2014 - 8:19 am

Is it a chemical storage space?

Marina Andrade

Sustainability Consultancy Services
Cushman & Wakefield

LEEDuser Basic Member

17 thumbs up

February 7, 2014 - 8:28 am

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?

Andrew Mitchell, P.E.

Principal
Mitchell Gulledge Engineering, Inc.

LEEDuser Expert

126 thumbs up

February 7, 2014 - 8:31 am

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.