When doing repairs at a home that had a long time squirrel problem, because even new attic vent fans have flimsy screens.....fit an extra screen of 1/2 inch steel hardware cloth over the existing screen (shaped in the fashion shown) before the fan is mounted, preventing future squirrel intrusion.
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Extreme Squirrel Problems in Attics & Crawlspaces
Dealing with Desperate Homeowners
I deal with desperate people. Even the sweet little old ladies tell me, “Mr. Earl I don’t care what you have to do to the squirrels, just get them out of my attic.”