I own two of these air curtains to use at my home. I bought one as an experiment to check it out first. I took it apart to paint it so it would match my brick and liked it so much, I got the second one. Easy to install and easy to use. I mounted on the exterior out-swing back door on my lanai so I had to make my own activation bracket. We have many flies in our backyard area due to weekly barbecuing and the three dogs we have, constantly going outside to go to the bathroom or to just hang out. Before these air curtains, if we opened the door, the flies would come inside in droves. Not any more. There is the occasional insect that gets in, but nothing like before. Well worth the investment!