Draft air entry prevention device for aperture in building has fan or compressed air device spaced out by air gap from building

摘要

The draft air entry prevention device has an air gap (8) separating the fan or compressed air device (4) from the building (3), so that during the operation of the fan or compressed air device, air is sucked out through this gap. The fan or compressed air device may be at the side edge of the aperture (2).