HVAC Duct Manual Volume Damper 4Inch Air Flow Regulator Airflow Ducting Backdraft Damper for Air Ventilation System (4 Inch)

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About This Specification: Port Outer Diameter: 4"/ 100mm; Adjustment Handle Materials: Stainless Steel. Robust Materials: The body of the HVAC Duct Manual Volume Damper is made fro m stainless steel material and the flap blade is made from aluminum, which is wear resistance and can be used for a long time. Function: Airflow Ducting Backdraft Damperhelp regulate the amount of air that passes through the ducts, allowing you to maintain optimal airflow levels for heating, cooling and ventilation purposes. Perfect Design: Air Flow Regulator features a rubber seal ring inside, which can prevent the air duct valve from leaking when it is closed Package Content: 1Pcs* HVAC Duct Manual Volume Damper. Show more