High velocity industrial air curtain systems for climate separation in openings up to 26 feet high. Retains heated/cooled air and stops outside winds up to 18 MPH. These units can be heated using hot water, steam, or gas. Some models can be electrically heated. Make-up air models also available. Low velocity, comfort control air curtain systems that prevent cold or hot air from entering through pedestrian openings which are exposed to inclement weather and wind. These units can be heated using hot water, steam, or gas. Some models can be electrically heated.