Eldridge represents Berner’s quality air curtains and we can evaluate, size, and order the right curtain for your application. They’ve written an excellent article that goes into great detail about air curtains. Here are some of the basic information about air curtains from the article:

What is an Air Curtain?

An air curtain, also known as an air door, is a machine that blows a controlled stream of air across an opening to the other side to create an air seal. This seal separates different environments while allowing a smooth, uninterrupted flow of traffic and unobstructed vision through the opening. Because they help to contain heated or conditioned air, they provide sizable energy savings and increased personal comfort when applied in industrial or commercial settings. They also help to stop the infiltration of pollutants and flying insects.

Do Air Curtains Keep Flies Out?

Yes! And mosquitos, yellowjackets, and bees. Air curtains, sometimes referred to as fly fans, supply a high velocity stream of air across a door or window opening that keeps pests like insects from entering the building. These flies and other small insects, find the air stream too powerful for them to fly through and if they try, they are blown down or sideways before they can enter the building. 

By Ed Neese

Source: https://eldridgeusa.com/blog/the-many-benefits-of-using-air-curtains/