4 Inch Backdraft Damper Duct Insert With Spring Loaded Folding Blades For 4 Inch Ducts In Range Hoods And Bathroom Fans No Backflow One Way Airflow With Airtight Gasket Seal Mounts Horizontal Or Vertical

4-Inch Backdraft Damper - Single Unit for 4 in Ducts
✔️ Fits 4 in duct openings; 5.03 in long; galvanized steel

This antidraft duct insert is designed for use with range hoods, bathroom fans, and other home HVAC applications. It features outer rubber gaskets that create an airtight seal and grip between the damper and ducts, and it can mount horizontally or vertically to prevent backflow and debris from entering ducting. The galvanized steel body houses spring-loaded aluminum damper blades that open with minimal airflow, making it a practical choice for 4 in duct openings.

✅ Fits 4 in (101.6 mm) duct openings
✅ Length 5.03 in (127.8 mm)
✅ Galvanized steel body with spring-loaded aluminum damper blades
✅ Outer rubber gaskets provide airtight seal and grip
✅ Mounts horizontally or vertically to prevent backflow and debris entering ducting
✅ Powder-coated black finish

💡 What is a backdraft damper used for in home HVAC systems?

Backdraft dampers are handy for preventing reverse airflow and keeping ducts clean. They’re a handy choice for exhaust and vent lines.

- backflow prevention in exhaust ducts - reduces drafts and debris entry in kitchen and bath vents - works with 4 in ducting and simple to mount horizontally or vertically - durable galvanized steel housing with spring-loaded blades