It is used as an air regulating element in air handling units, air ducts and similar systems and units. Outer casing and blades are made of natural anodized aluminum or galvanized sheet, gears and bushings are made of glass fiber plastic material, arms are made of plastic or cadmium coated metal material. It has been designed in accordance with manual and motor control, precise adjustment of the blades with the bedding on the gears. It is manufactured in different sizes as narrow or wide wings depending on the project conditions.