how thin can a duct be?
I am doing a basement remodel. We have one branch line duct we have to run on the bottom of the joists for about a 5 foot length. Unforntunately, it is in the middle of the basement. Currently this duct is 3.5x10. 35 sq inches.
As basement height is an issue, I would like to minimize the thickness of this duct.
Is it resonable to get a custom duct that would be 1.5x24 (36sq inches) or 1x36 inches?