Why are bathroom exhaust fans so important? Simply put, they help keep your wettest room dry.
Perhaps the worst enemy of our homes is having water there should not be water. This includes both slow leaks (slow leaks are so bad because we sometimes put off tending to them, sometimes for years) and standing moisture.
I recommend you ignore most suggestions about ran size and install the largest bathroom exhaust fan you can reasonably fit in.
Is your bathroom a standard hall bath of 8 x 5 x 8? That is 320 cubic feet. A 250 CFM (cubic feet per minute) fan will suck the air out of that room in 90 seconds. I see no reason not to install this fan.
Realistically for a bathroom that size you’ll install a 100 CFM fan, and that will still suck the air out in 3 1/2 minutes. Still good, but not as good.
Why does this matter? By sucking the air out of the room, you suck out the moisture.
I personally am a fan of Airscape fans, and they’ve recently”repackaged” (for lack of a better word) their offerings to make it easier to pick the best one for your bathroom.
Basically they now call them “small”, “medium”, and “large”, which may not be the greatest innovation in history, but is definitely clearer than using model numbers, which is what most fan manufacturers do.
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