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#19256 - 12/22/02 04:10 PM inter locking exhaust with make up air unit
gunrunner Offline
Junior Member

Registered: 12/22/02
Posts: 3
Need help with inter-locking 2 exhaust fans with a make-up air unit?

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#19257 - 12/22/02 04:33 PM Re: inter locking exhaust with make up air unit
spyder Offline
Member

Registered: 10/14/02
Posts: 211
Loc: Massachusetts
I had to do this for a commercial kitchen exhaust fan a year ago. I had a single pole switch in the kitchen pull in a normally open relay that energized a small sub panel that housed only the fan circuits. The feeder circuit for the sub panel was also on a shunt breaker, so it could be de-energized in the event that the fire alarm system was activated.

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#19258 - 12/22/02 04:39 PM Re: inter locking exhaust with make up air unit
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
gr — You have to decide which one {exhaust fan or "make-up vent"} controls the other. Also, is simple interlocking of starter controls acceptable, or do you need something like a vane or sail switch to prove air flow? it is possible a vane switch may be necessary anyway if the “make-up vent’ is a non-powered, passive or static device. [Make it a profitable opportunity at any rate.]

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