Anqtovp 4 Inch Draft Blocker Backdraft Damper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector for Dryer Vent Hose

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This 4 inch backdraft damper is designed to fit over the TD lip and prevents air from re-circulating when fans are not in use, improving ventilation efficiency
Constructed with a galvanized steel body and flap leaves, aluminum axis, and carbon steel spring, this damper offers reliable durability for HVAC applications
Installation is simple by inserting the backflow flap into the ventilation pipe until it stops, with the spring positioned horizontally for optimal operation

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The Anqtovp 4 Inch Draft Blocker Backdraft Damper is engineered to enhance your home's ventilation by preventing unwanted air backflow when fans are off. Made from galvanized steel with aluminum and carbon steel components, this damper is built for lasting performance in a variety of HVAC setups. Its one-way airflow design allows the damper blades to open with outgoing air and close automatically to block reverse flow, maintaining air quality and energy efficiency. Installation is straightforward—simply insert the damper into your metal ducting, ensuring the spring is horizontal for best results. Perfect for use with range hoods, bathroom fans, and kitchen ventilation, this damper is compatible with both flexible and rigid metal ducts, but not with plastic ducts.

This 4 inch backdraft damper is designed to fit over the TD lip and prevents air from re-circulating when fans are not in use, improving ventilation efficiency
Constructed with a galvanized steel body and flap leaves, aluminum axis, and carbon steel spring, this damper offers reliable durability for HVAC applications
Installation is simple by inserting the backflow flap into the ventilation pipe until it stops, with the spring positioned horizontally for optimal operation
Compatible with both flexible and non-flexible HVAC ducting, this back draught valve is suitable for range hoods, bathroom fans, kitchen, and other home ventilation systems
The damper blades open automatically under airflow pressure and close in the opposite direction via the spring, effectively cutting off reverse air flow
Not suitable for use with plastic ducts due to size differences; designed for metal duct compatibility only and includes one piece per package

Anqtovp 4 Inch Draft Blocker Backdraft Damper One-Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector for Dryer Vent Hose

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