We have some vents but no fans. Should get some, but not sure I want hubby on the roof any time soon. LOL!
I hope getting him fixed will take care of his aggressive behavior and his marking tendencies. Peaches is fixed and he NEVER did that until we had all those cats, and now he occasionally gets in a mood.....
You don’t install the fans from outside. You do it inside, in the attic. They aren’t very large but they make a difference.
Our other males were all fixed pretty much right away and haven’t been bad about marking in the house. Jasper was good, too, until Simon reappeared and they got into a fight. He hasn’t been back to the house since then, near as I can tell, but he’s still around at the barn. I heard him yowling the other night when I was on the carport with Jasper.