[Upgraded] Hon&Guan 4 Inch Backdraft Damper, One-Way Airflow Duct Damper 4 Inch Ducting Insert Backflow Preventer Duct Draft Blocker.

Additional Details from the Manufacturer

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More features

• 【Upgrade design】 The 4 inch damper on both sides of the top and bottom of the two new concave inward pressure rib, and increase the thickness to 0.6mm,to ensure that the product is more solid, not easy to damage.
• 【Material】The backdraft damper and the flap leaves is made of a galvanized steel, the axis are made of aluminum, while the spring are made of carbon steel.
• 【Installation method】The 4 inch duct damper has an opening of 100 mm and a length of 88 mm. When installed horizontally, the spring should be positioned horizontally so that it can be opened and closed optimally.
• 【Wide applications】Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible. Designed for use with dryer vent backflow preventer, range hoods, bathroom fans, kitchen and other home HVAC applications.
• 【Lightweight valve wings】The valve wings open under the pressure created by the airflow; when the air flows in the opposite direction, it is automatically closed under the action of the spring, so as to cut off the flow. Rubber ring ensure 100% closure and quiet closing.