An air curtain is a continuous stream of air that is circulated across the doorway of an air-conditioned space. It reduces the entry of flying insects and unconditioned air into this space by forcing a stream of air over the entire entrance way. The air stream layer moves with a force and at an angle that prevents unwanted air from trying to penetrate the curtain. An air curtain can pay for itself in no time by reducing the load on the building's heating or air conditioning system. It is perfect for applications such as restaurants, freezers / coolers, supermarkets, customer entrances, and much more.