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Just to add to that- if at all possible, add a 6” line for your exhaust fan even if you don’t up-size the fan at this point. (If it isn’t already 6”)
Contractors installed a 4” line in my room. That didn’t allow me to upsize the fan while I realized my 80 CFM wasn’t cutting it.
I had to rip into my ceiling and add a 6” line after the fact. I hate drywall work especially when i have to worry about not making a mess in an active living space.
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