I have this scenario. I have a 1500 CFM fan that requires a 10" duct.
My floor joists are 9.5 inches wide. If I go with the 10" duct specs, I'll
have to build a chase to cover the duct, and this will cause several design
problems within the room as well as being more costly.
However, if I use a 9" duct, I can install the ductwork between the joists
and not have to build a chaste.
What will decreasing the 10" rated duct to 9" do to the functionality of
the fan? If I have 1500 CFM with 10", what performance loss will I realize
with 9"? Are there any other concerns going with 9" over 10"
Thanks in advance for your responses.
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