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Why you need an air door aka air curtain in your house or office? Because it prevent cool air from inside to escape and hot air from outside to get in when the door is open.
This device takes air from the outside, pass it through a compressor and when the door is open it blows down a curtain of compressed air that acts as a barrier for climatic exchange, pollutants fromo outside and insect penetration.
This item can be modified and copy to fit any door or entrance width and wall thickness.
