I did the usual CFM calculation for my bathroom and came up with 68 CFM. So
anything rated 68 CFM and above would work. I've been looking at 80 CFM
fans and also 100 CFM fans. If I go with a 100 CFM fan (or even 110) would
that be too powerful for my small bathroom or it doesn't matter?
its probably more important to have a air intake to the room so air
can flow, perhaps a louver in the door or some such.
otherwise the room is sucked to a vacuumn and the blower is
you can also install a fan thats at a remote location, like the point
where the air exits the home.
much quieter that way
I think there are some possible issues with the backflow of combustion
gases from furances or hot water heaters with an overly aggressive exhaust
My guess is you need the right other ingredients (very tight house, minimal
or no fresh air intake, gas hot water heater & furnace, strong fan and
limited loss exhaust duct) for this to be a significant issue, but I've
heard it mentioned more than once.
My personal experience has been that most insulated flexible exhaust
ducting of any length is so grossly inefficient that you almost need a high
CFM fan for it to be effective at all.
Also, when I mount the fan housing to the ceiling joist should I make use of
rubber stand-offs (washers) between the joist and the housing (to eliminate
any vibration/noise (in case there is any) against the wood joist?
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