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A Volume Control Damper (VCD) is a valve that stops or regulates the flow of air inside a duct or other air handling equipment. A VCD may be used to cut off central air conditioning to an unused room, or to regulate it for room-by-room temperature and climate control. Jointair new manual volume control damper is made galvanized steel with one single blade inside the damper. The minimum diameter is 4'' (150mm) and the maximum diameter is 18'' (450mm). 1. The single blade damper is made of 0.6mm galvanized seel. The deep of the damper body is 213mm. 2. 1/4'' aluminum hand quadrant which allow the damper open and closed from 0° to 90° to control the volume of the air stream 3. Rolled ribs in the galvanized steel frame provide greater reinforcement, ease of installation, and sealing joint.