Awoco FM15-MSD Early Turn On Super Power Indoor Air Curtain, UL Certified 120V Unheated with Magnetic Switch and Motion Sensor Detection

Motion Sensor 7 to 9 feet Detection - The motion sensor detects walk-by people within 7–9 feet and activates the air curtain 1.5 seconds later. It runs for 40 seconds. With early turn on, the air curtain generates high air pressure indoor,  it prevents the dust / heat / unwanted small particles to enter inside once open the door. This new special feature is more effective than the other door triggered air curtain to blow out the unwanted particles right at the moment opening the door. (36"/42" with Front BUILT-IN Motion Sensor) Powerful Unheated Air Fan - it does not generate cold or hot air. Air curtain is a powerful fan that creates a high speed air stream over the entrance to isolate the interior and exterior air environment while blocking the entry of dust, heat, smoke, and small particles. Powder coated metal case, easy to clean slim body. US Patented Magnetic Switch Controlled Circuit (Patent No. US10584889B2) - The motion sensor detection turns on the air curtain for 30 sec