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Well, there’s no specific building code requirement for the bathroom vent location / exhaust fan installation. You can have it anywhere on the ceiling or wall … I guess the floor would be also OK , but I’ve never seen such installation. The one you see on the picture is slightly above the floor level, and I personally guarantee that in this location works like a charm (this bathroom has one more above the shower stall).CFM – cubic feet per minute – general term used to specify the amount of air that the bathroom fan (in our case) is able to move within one minute of its operation.
However, in general, placing the vent in the areas other than the ceiling or upper sections of the wall will compromise one of its main purposes – moisture removal. Proper bathroom exhaust vent placement becomes critical if you have any sources of hot, moist air in the bathroom area (tub, shower, steam room, etc.), and the best strategic vent location would be directly above or as close as possible to that source, but still high up.
If you install the bathroom fan directly above the tub or shower, it must be listed as suitable for such locations and must be installed on a GFCI protected circuit – this is every manufacturer’s (not the code’s) requirement.
Very important thing to remember is to properly size your bathroom exhaust fan, and the formula is very simple … actually there are three simple methods to do it.
Calculations are based on the size of your bathroom and you can do it manually or use my Bathroom Vent Calculator – enjoy it.
For more bathroom fan information and installation requirements, visit Bathroom Exhaust Fan GFCI Protection
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