Dayton Electric MFG. Co. Compact 48" Air Curtain Model 3C670 UL 38L6 Standard air curtains install over doorways, windows, and other openings in a structure and create a wall of air. This air-based barrier keeps conditioned air inside the building, reducing energy lost through open doors. They also help keep pests, dirt, and debris outside a building. They are commonly used for high-traffic entrances and exits in areas prone to high-temperature differentials between indoor and outdoor air. Images will be loaded shortly