JanAire curtain systems use PolyVent material that is inflated and deflated to open and close the sidewalls of your hog or poultry barn. They seal tight and provide an insulation effect to keep barns warmer in the winter and cooler in the summer, while also allowing natural sunlight to brighten the barn interior. JanAire systems are easily maintained and function without the use of ropes, pulleys, winches or limit switches.