Title: Simple design, works well.
Review: It does what it says. Nothing exceptionally good or bad.The unit I got has a removable plastic grill at the bottom to prevent things from going in from outside. The product description doesn't show the grill. I think it is a useful feature to prevent squirrels or other critters from going in.The spring loaded door works fine. There is a a slight air gap (very slight) when closed. Perhaps a stronger spring would have held it down a bit better.Other than that minor point, I like the wall cap. I use it with a 6-inch inline duct fan to exhaust soldering smoke from my garage lab setup. I would give it a 4.49 rating :-) if I could. But as I can only do whole numbers, I'll give this a 4 star, dinging 0.51 star for the little airgap in the door :-)
Is this product review negative?