4" Hvac Duct Manual Volume Damper Galvanized Steel Adjustable Airflow Control

The manual volume damper is used for air volume regulation in an air ventilation system, widely used in HVAC industry. With that installed in your HVAC systems, you can easily control the air flow rate or close off an air duct if needed, to some extent, it will increase the energy efficiency of your system.SpecificationColor: Silver ToneMaterial: Galvanized SteelInner Diameter of Interface: 99 mm / 3.9 inchMax Outer Diameter: 100 mm / 3.94 inchHandle Length: 150 mm / 5.91 inchOverall Size: 150 x 0.6 mm / 5.91 x 0.02 inch (L*T)Packing List: 1 x Duct Manual Volume DamperAdvantage1. Made of thick galvanized steel plates, this HVAC volume damper is sturdy and long lasting with excellent rust proof, oxidation resistant and anti corrosion properties.2. The side is designed with a rotary handle, which can adjust the air volume from multiple angles and is easy to operate.3. With a smooth and flat interior design, it can ventilate rapidly.InstructionEasy to install, just simply slide the volume damper into the pipe you are attaching to, and fix it with pipe clamp and tape. (pipe clamp and tape are not included here)NOTE: Please confirm the inner diameter of the air volume damper before placing an order and the recommended temperature range is -10 - 70 centigrade.