I am looking to upgrade the cheap builder installed exhaust fans in my
bathrooms. They are incredibly loud.
I can find lots of nice quiet ones, but they all required 4 inch (or
greater) ducts. The only 3 inch duct vents I can find are...cheap and
Does anyone know of a decent fan that will work 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
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
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...
For the home as a whole, your comment makes some sense. However since
that warm moist air stuck in the smallest room in the house means mold and
mildew, they do make sense. Even your examples do not apply at all likely
combinations of conditions.
for quietest installation the fan goes in the attic and the intake
feeds to it from the bathroom.
see:Bathroom Exhaust Fans:
"A sone is a measure of loudness. The higher the sone rating the louder
Understanding how loud an exhaust fan will be can be difficult, largely
because bathroom exhaust fans are measured in sones, while most common
noise levels we are familiar with are measured in decibels.
Scientifically, one sone equals 40 phons, which is the loudness of a
1,000 hertz tone at 0 decibels above our threshold hearing level. The
relationship between phons and decibels is not one-to-one (affected by,
for instance, frequency), but for our purposes we will assume that
decibels are roughly equivalent to phons. The chart below compares the
sound level of a sampling of exhaust fans with the sound level of a
number of other common sounds.
Panasonic 60 cfm FV05VQ2 Fan
A Quiet Refrigerator
Panasonic 100 cfm FV11VQ2 Fan
Panasonic 380 cfm FV40VQ3 Fan
Nornal Television Volume
Note that two sones are twice as loud as one sone, three sones are
twice as loud as two sones, four sones are twice as loud as three
sones, and so on."
The Panasonic Whisper fans are outstanding!
for some excellent information and prices
(under Heating and Ventilation)
They also sell the duct adaptors for 4" to 3"
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