Re: Exhaust Fan Venting Question
You could also look at a Fantech remote mounted axial fan. You can then just use any HVAC returb boot or just a simple return grill for minium clearance.
I have a 6" remote fan that draws from two returns in a larger master bath.
You can alos use 3" up to a 4" axial fan... or better use two return grills and 3" to each to a single fan. Pretty easy to use a 3" or 4" hole saw to cut the holes.
The remote fans are really, really quiet too. Almost silent if installed with flex duct.
1925 Two-Story Stucco Beaux Arts Neoclassical