Used to regulate air provision manual or driven by electricity (open-close or analog). The body is fabricated from galvanized plate, the blades are aerodynamically designed (for the minimum possible resistance) constructed by aluminum and gears moved by synthetic material. The length is 110mm and the other two dimensions as ordered. Placed in air-shafts or air handling units, in order to regulate air supply. Fine dampers that instantly seal in case of fire not letting fire spread through the air-shafts, are also provided.