Steven wrote:
Hi,
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
loud.


The Panasonic Whisper fans are outstanding!

Check out
https://www.westsidewholesale.com/
for some excellent information and prices
(under Heating and Ventilation)

They also sell the duct adaptors for 4" to 3"