Upgrading Bathroom Exhaust Fan with 3 inch ducts

I think you can get an adaptor that will connect the 4" to the 3". It will
make the fan a little louder than it should be, but if you buy a good
quality quiet fan it will be a lot quieter than the cheap one you have now.
Have you checked out the Panasonice "Whisper" fans? They're the wuietest
(and most energy efficient) on the market. They're expensive, but good. Good
luck.

...

bath exhaust fans are a bad idea anyway for a home...

in the winter they draw heated moist air outside,,,,instead... after
your shower, just open the inside door and keep that warm moist air in
your house..

in the summer, open a window...

if your using central AC in the summer, you are still better off
closing the AC vent in the bath and opening the window...

Mark

Use a 4 inch duct nothing less than 125cfm,s to make it worthwhile and
insulate the duct if you live where it snows

May be he is trying to remove the smell instead of moist warm air.

...

One reason they are quieter is because of the larger ducts. That and
they generally also move more air.

--
Joseph Meehan

Dia duit