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

Outer Diameter of Interface: 195 mm / 7.68 inch; Overall Size: 200 ± 0.5 mm / 7.87 ± 0.02 inch (*); Color: Silver Advantages: 1. Constructed from Galvanized Iron, offering hardness and resistance, resistant to deformation and corrosion, moisture-proof and fade-resistant, for extended use; 2. The side handle design, allowing air volume adjustment from various angles and to handle; With smooth and flat interior structure, enables ventilation. 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 .