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post #2 of (permalink) Old 2012-04-15, 11:23 PM
Join Date: Oct 2008
Location: Canada
Posts: 1,938
It's important to check the required vent pipe size.

The 4" pipe that many contractors use cripples all but the smallest kitchen exhaust fans.

Even 6" isn't sufficient for over a couple hundred cfm.

WARNING: The HVAC information I provide is not based on field experience and DOES NOT constitute professional advice.
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