ACSON AIR CURTAIN 4X12 D Standard Series Acson Air Curtain, This “Invisible door” serves the shut-out function for indoor cool air retention, blocking out unpleasant dust, fumes and odors, zoning function for separating air-conditioning zone & non air-conditioning zone, smoking and non-smoking areas and it may even be used for air circulation purpose. ↪Sirocco fan design with powerful airflow ↪Adjustable deflector to position according to different preferences ↪Quiet Operation ↪Selectable fan speed with a switch control - (High & Low ) ↪Slim profile and elegant design blends with any interior ↪Simple installation in 3 simple steps: ⚒ fix installation plate, hang the body & tighten ↪ Air flow up to 12ft height ↪Types of casing - Metal Casing (D series)