The reason we bought it was to keep the neighbors flies from there horses out of the house. Which it did by 75%. That is really good. It's doesn't however keep the Mosquitos out but then again that's hard to do living in British Columbia. We are very happy with the look and they even sound nice in the wind. We just ordered a second one for our bedroom door. (we have French doors that are large and would have to custom make screens). For the price they work perfect.