Venting three bath fans at a porch roof
I have three new Panasonic bath fans serving my top floor. The attic is now foamed and a semi-conditioned space.
The old fans were vented through the roof using three-inch flex duct. I was going to redo these lines with four-inch metal pipe. Now, I am considering a different approach that would be much easier to execute while allowing me to eliminate three problematic roof penetrations.
The top floor has a fairly sizable covered porch. There should be plenty of room to run the exhaust lines out over the porch and vent down to the outdoors. It will be much easier to run the lines horizontally across the attic instead of angling them up 12 to 15 feet to reach the roof line.
Thoughts? Acceptable plan or a headache in the making?
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