4 Inch Backdraft Damper Draft Blocker For One Way Airflow In Ducting Systems Beefed Up Duct Damper Insert Backflow Preventer Inline Fan Vent Deflector Black Finish Ideal For Attics Basements And Crawlspaces
✔️ Galvanized steel damper with 0.6mm ribs, black finish
This 4 inch backdraft damper blocks reverse airflow in ducting systems, ideal for attics, basements, and crawlspaces. Handy for dryer vents, range hoods, bathroom fans, and kitchen exhaust lines. Key dimensions:
| 寸法 | サイズ |
|---|---|
| オープニング | 100 mm (3.94 in) |
| 長さ | 88 mm (3.46 in) |
Features: lightweight, corrosion-resistant construction with a black powder coat finish, designed to clamp into both flexible and rigid ducts. The damper uses two 0.6 mm thick concave ribs, aluminum axis, and carbon steel spring for reliable operation. In horizontal installation, the spring should be positioned to ensure optimal opening and closing.
✅ Galvanized steel damper leaves with 0.6mm ribs for solid construction
✅ Aluminum axis and carbon steel spring for smooth operation
✅ Black powder coat finish resists corrosion in humid spaces
✅ Fits 4 inch ducting with 100 mm opening and 88 mm length
💡 What is a backdraft damper used for in home ventilation and exhaust systems?
- Prevents reverse airflow in ducts to keep conditioned air inside
- Helps minimize energy loss by blocking backflow through vents
- Handy for attic, basement, crawlspace, and general HVAC lines
- Works with 4 inch ducting and features galvanized leaves and aluminum axis