Copkim 2 Pcs 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector, Only Fit with Metal Conduit

Copkim 2 Pcs 4 Inch Draft Blocker Backdraft Damper Duct Draft Stopper One Way Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector, Only Fit with Metal Conduit

• Quality Material: our 4 inch draft blocker is crafted of galvanized steel that ensures long service; Blade crafted from aluminium, axis and spring are made of stainless steel, which tightly seal the rubber gaskets attached to the outside of duct to create an airtight seal and grip between dampers and ducts
• Easy to Install: you can push the baffle into the end of the duct to install our backdraft dampers; When mounting horizontally, the spring position should be in a horizontal position to open and close in an optimal manner
• Effective Design: the 4'' damper shutters achieves maximum air balance through its unidirectional, 2 spring loaded folding blades, ensuring uninterrupted air flow in the desired direction while preventing reverse flow, can be widely applied in air conditioners, exhaust fans, extractors, range hoods, heating ducts, vents and more
• Proper Size: the HVAC duct damper measures about 4'' in diameter and 2.12'' in height, a fit compatible for 4'' ducts; Suitable for a variety of duct systems, it boosts airflow while improving efficiency, making it a versatile addition to your equipment
• You Will Receive: 2 pcs 4 inch backdraft dampers, not only open and close automatically but are designed with sturdy springs to facilitate horizontal and vertical installation, giving you seamless installation experience with convenience and efficiency