It's for our range hood and has a 5 inch now and I would like to put in an 8 inch. 2 x 12 is behind boards in pic. How much are you allowed to take out of the 2 x 12 rim joist for the second floor?
source https://www.inspectorsjournal.com/topic/19170-8-inch-vent-in-2-x-12-rim-joist/?do=findComment&comment=176246
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