Hyjoy 8" HVAC Duct Manual Volume Damper, Metal Adjustment Airflow Ducting Backdraft Damper Control for Air Ventilation

Outer Diameter of Interface: 197 mm / 7.76 inch; Overall Dimensions: 197 mm by 1 mm / 7.76 inch by 0.04 inch (*); Color: Silver Advantages: 1. Constructed from Galvanized Iron, offering hardness and temperature resistance, resistant to deformation and corrosion, moisture-proof and fade-resistant, suitable for long-term use; 2. The side handle design, allowing air volume adjustment from multiple angles and ; 3. The interface is smooth and flat, to disassemble and install. The rubber design prevents air duct leakage when closed. Instruction: To install, slide the volume damper into the pipe you are , and with pipe clamps and tape. Application: The manual volume damper is for air volume regulation in ventilation , widely applied in the HVAC industry. With it installed in your HVAC , you can easily adjust the air or shut off the air duct if necessary, to some extent, it will the efficiency of your setup. Note: Confirm the outer diameter of the volume damper before .