Exhaust fan for restroom
Exhaust fan for restroom
(OP)
Hi,
I need help finding litrature and advise on design of a central exhaust system from large public restrooms. Each facility has about 10 sanitary fixtures. 75 cfm per fixture is my target. Restroom is on first floor and exhaust must be thru roof on 3rd floor. Would the fan go on the roof or is it better to place fan above cieling-if there is space.
thanks,
I need help finding litrature and advise on design of a central exhaust system from large public restrooms. Each facility has about 10 sanitary fixtures. 75 cfm per fixture is my target. Restroom is on first floor and exhaust must be thru roof on 3rd floor. Would the fan go on the roof or is it better to place fan above cieling-if there is space.
thanks,





RE: Exhaust fan for restroom
RE: Exhaust fan for restroom
Regarding the inside/outside thing, ideally, you want the fan outside, but as a compromise, if you have to (or want to go inside) try to keep it in the 3rd floor ceiling space near it's point of discharge to the outside. The reason for this is that way all (or most in the compromise situation) of the ductwork will then be under negative pressure throughout it's run through the occupied spaces. If there is a leak (and ductwork is rarely air-tight), it will draw air into the duct rather than discharge odorous air into the occupied areas.
The total external static pressure of your system should not be different regardless of the fan's position in the system (at one end or the other or somewhere in between).