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Air curtain is a powerful fan that forcing a high speed air stream over the entrance to isolate the interior and exterior air environment. It consumes less energy than an air conditioner. Air curtains are widely installed at the entrances of supermarkets, theaters, hotels, food storage warehouses, residential, etc. It keeps the flying insects out and keeps conditioned air inside, reduces energy costs.The magnetic switch can be simply sticked to the middle of door and door frame, no bracket needed. Works easily with most doors and windows. Automatically turn on the air curtain with door open; shut off the air curtain with door close. This air curtain generates powerful air stream but running quiet. It is to keep the flying insects out, perfect for office, restaurant, donut shop or residential door entrance or drive-thru window. Summary: powerful air stream, small body, light weight, low noise level, remote control & magnetic switch.