I would like to make sure what does "dedicated/designated exhaust" mean. Can all hazardous gas and chemical use areas have one exhaust system combined with the exhaust from toilets or does every kind of spece (eg. copy rooms, janitor room) have to have a separate system and fan?

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Michelle Halle Stern

Principal

UpFront Regenerative Design

LEEDuser Premium Member

99 thumbs up

Mon, 02/08/2016 - 15:22

Dylan should confirm, but yes you can combine the exhaust with toilets. I'm less certain about whether you can also combine one hazardous/chemical use with another.

Dylan Connelly

Mechanical Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Fri, 02/12/2016 - 16:36

Yes you can combine the exhaust systems.

Lyle Axelarris

Building Enclosure Consultant

BPL Enclosure

LEEDuser Basic Member

58 thumbs up

Wed, 07/20/2016 - 21:39

Similar question - does the exhaust need to run 24/7, or can it be shut down when the building is unoccupied to conserve energy?

Dylan Connelly

Mechanical Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Mon, 07/25/2016 - 19:55

Just during occupied hours. California's T24 says to start the building's ventilation (and exhaust) 1 hour before occupancy - LEED has no rules with this regard - just best practice.

Lyle Axelarris

Building Enclosure Consultant

BPL Enclosure

LEEDuser Basic Member

58 thumbs up

Mon, 07/25/2016 - 20:14

Do you have any citations for this that I can use for reference in case I get a review comment about it? I have not seen an LI or CIR for it, but I always like to be certain before it's too late to make changes. Thank you very much, Dylan.

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