If there is a strong possibility that Squirrels or Raccoons will enter a chimney, install a chimney cap preferably one made of stainless steel.
When two flues are in close proximity, making two separate caps impossible to install, obtain a Forever Stainless Steel Chim Cap to cover both flues at the same time.
Chim Cap Link:
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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.”