Extruded Aluminium Volume control damper opposed blade with Airfoil type Blades. It is also known as Low Leakage Damper with low pressure drop and noise levels. It regulates the flow of air inside a duct or air handler or other air handling equipment. It may be used to cut off the air to an unused room or to regulate the air in different parts of the building depending upon temperature, climate control, occupancy, etc. can be operated manually or motorized. Motorized dampers are used to regulate air flow constantly and are operated by actuators which in turn are controlled by a thermostat or building management system.