The 5" galvanized wall vent cap with damper was well made, matched the drawing specs and had good joints and seams. The damper spring provides the proper amount of resistance and the rubber lip around the opening prevents annoying metal on metal clanging when the damper closes. It was one of two wall caps installed (the intake wall vent cap only had a screen) for a portable room air conditioner because casement windows do not allow conventional installation in a vertical or horizontal sliding window. I was also delighted by the quick shipping and good packaging. I'll definitely return to Supply Stop when I need similar products in the future.

I would recommend to anyone