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exhaust fan roof vent

1190 Views 3 Replies 4 Participants Last post by  ryansdiydad
I have a square top roof vent that I want to remove and replace with a bathroom exhaust fan roof vent. The hole that is currently their is about 6" and the exhaust fan vent is for a 4" round duct. The hole will obviously be large enough for the pipe to fit through but is it too large of a hole?
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