4 Inch Backdraft Damper For Ducting With Galvanized Steel Body And Aluminum Flaps One Way Airflow Blocker Inline Vent Deflector Draft Stopper And Backflow Preventer For Residential Ductwork DIY Ready
✔️ Galvanized steel body, aluminum flaps, 4 in size, ready
This 4 inch backdraft damper is designed to snap into standard ventilation ducts, offering a one-way airflow blocker that stops air from flowing backward when fans aren’t running. It's a practical DIY-ready solution for homes and small commercial spaces, ideal for HVAC ducts, exhausts, range hoods, and other residential ductwork.
✅ 4 in (100 mm) galvanized steel body with aluminum flaps for durability
✅ Fits standard ductwork; inline damper designed for residential and light commercial use
✅ Push-in installation; ensure spring orientation is horizontal for best operation
✅ Not compatible with plastic ducts; dimensions vary ±1-3 mm (±0.04-0.12 in)
💡 What is a backdraft damper used for in duct systems?
Backdraft dampers help block reverse airflow and keep conditioned air in the intended space. They’re handy for HVAC duct runs in homes and light commercial setups.
- Prevent backflow in ventilation and exhaust ducts
- Improve energy efficiency and keep odors from spreading
- Simple inline installation for 4 inch ducts
- Best used in straight sections, avoid plastic ducts