Tough As Nails 7 Inch Backdraft Damper Butterfly Vent Flap Hvac Exhaust Solar Heating Intake Valve Horizontal Vertical Airflow Regulator No Sweat Install Smooth Kickback Blocker Design

Single Pack 7 Inch HVAC Solar Exhaust Backdraft Damper
✔️ galvanized steel body with aluminum flapper and foam gasket

This single pack butterfly vent flap acts as a no sweat install solution for home HVAC ducts, solar hot water loops, and basement exhaust stacks. It blocks unwanted reverse drafts and keeps your system circulating air smoothly while requiring zero wiring or batteries to run.

✅ 7 inch square opening fits standard metal flex ducting
✅ Opens automatically on forward pressure shuts tight via gravity
✅ Operates safely between minus 20 and 160 degree Fahrenheit ranges
✅ Foam perimeter seal cuts down on cold air infiltration

💡 How does a manual backdraft damper prevent reverse airflow in exhaust vents?

A working flap valve uses simple gravity and static pressure to stay sealed when ventilation stops.

This setup is pretty handy for DIYers who want to avoid complex actuators.

- Standard steel housing absorbs vibration without rattling loose

- Gravity drop mechanism creates an instant seal against wind blow back

- Foam lined edges keep dust and moisture out during idle periods

- Lightweight aluminum plate reduces motor strain on existing blowers

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