8 Inch Backdraft Damper[Upgraded], One-Way Airflow Duct Damper, Ducting Insert Backflow Preventer Duct Draft Blocker

Upgraded One-Way Backdraft Damper: This 8 inch backdraft damper features upgraded 0.6mm galvanized steel housing, two structural ribs, and triple springs for enhanced strength and long-term performance in ventilation systems.Reliable Anti-Backflow Control: Designed for one-way airflow, the lightweight damper wings open under pressure and close automatically in reverse flow, supported by springs and a rubber ring to ensure airtight, quiet operation—ideal for inline ventilation fan applications.Premium Materials for HVAC Use: The damper and flaps are made of galvanized steel, with aluminum axis and carbon steel springs, all heat-resistant up to 140°F—perfect for HONGUAN’s HVAC and air duct setups.Flexible Compatibility: Compatible with both flexible and rigid ducting systems. Ideal for use with range hoods, bathroom ventilation fans, kitchen exhaust, inline duct fans, and general ventilation systems.Easy Horizontal Installation: With a 200mm diameter and 88mm length, the damper is easy to insert. Ensure the spring orientation matches the airflow direction for optimal results.