This is just some information from my personal residence.
I knew the vent grills were blocked from paint and decided to replace them.
Glad I did, look at the size of the hole each and every vent had.
This is a 25+ year old house.
Just enough of a hole to let in some daylight to fool the city inspector and the job superintendent.
How much longer would it have taken to cut the right size hole?

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__________________
Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002