I installed these air vents in a closet where I needed some light convection to keep my cable modem and small UPS cool while out of sight. It's getting hot in the closet. I drilled a 4 inch hole and they fit perfectly and are tight. Once you push them in, they won't pop out again unless you get to the ground and push them down. Black plastic mostly disappears in my room. I don't even notice her.
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