4" Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Duct Insert Backflow Prevention Inline Fan Vent Deflector Silver

4" Draft Blocker Backdraft Damper Duct Draft Stopper One-Way Airflow Duct Insert Backflow Prevention Inline Fan Vent Deflector Silver

Q: Can this be used to stop my Hot water tank from blowing out the flame on windy days?

sorry, I did not use it for the flame from HWT.

Q: can this be used on a dryer vent or will the foam seal melt?

I would say the dryer heat could damage or maybe even melt the seal. Maybe you could try removing the gasket and wrap a strip of fiberglass in it’s place.

Q: Would this help keep out bugs?

Yes it creates a barrier and only opens one way from the inside of house

Q: Would this fit between two sections of standard, 4 inch semi-rigid ducting? Looking to add to bathroom vent fan ductwork.

Yes, that's exactly how you would use it. Make sure to buy the correct HVAC aluminum (metallic) duct tape for the connection. A clamp cannot be used bc the crushing pressure would inhibit the flapper from working properly.

4.4/5

Product ID: 731938600

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🔄One-way airflow backdraft prevention

⚙️Spring-loaded flap for smooth operation

🛠️4-inch galvanized steel build

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Description

🚫💨 Stop the Backdraft, Start the Fresh Flow!

VERSATILE INSTALLATION - Fits both flexible and rigid ducts with easy push-in setup—no tools required.
UNIVERSAL COMPATIBILITY - Perfect for AC units, exhaust fans, range hoods, and heating ducts across residential and commercial spaces.
OPTIMIZED FLAP MECHANISM - Spring-positioned flap ensures seamless opening and closing for maximum airflow control.
PRECISION ONE WAY AIRFLOW CONTROL - Prevents unwanted backdrafts, optimizing your ventilation system’s efficiency.
DURABLE GALVANIZED STEEL CONSTRUCTION - Engineered for long-lasting performance and corrosion resistance.

The 4" Draft Blocker Backdraft Damper is a robust ventilation accessory crafted from galvanized steel with an aluminum flap. Designed to fit standard ducts, it prevents reverse airflow with a spring-loaded flap mechanism, enhancing air quality and system efficiency in residential, commercial, and industrial environments.