8 Inch Backdraft Damper Back Draft Vent Duct Shutter Blocker, Backflow Ducting Insert One-Way Airflow Preventer with Inline Springs Loaded Folding Blades, HVAC Extractor Range Fan Hood Deflector GWG Detailed installation instructions will guide

Detailed installation instructions will guide you how to perform quick installation

ASY TO INSTALL - The black pendant lighting package includes installation instructions and mounting accessories for quick and easy installation

skin-friendly warmth at night

will not easy to fall for a long time

8 Inch Backdraft Damper Back Draft Vent Duct Shutter Blocker, Backflow Ducting Insert One-Way Airflow Preventer with Inline Springs Loaded Folding Blades, HVAC Extractor Range Fan Hood Deflector GWG Detailed installation instructions will guideQuality MaterialThe backdraft damper is made of galvanized steel, the flap leaves are made of aluminu, and the axis and spring are made of stainless steel, which can withstand temperatures up to 50C Practical FeaturesThe air duct choke prevents cold air or wind from entering the ventilation duct. The backflow flap opens and closes automatically at low air volumes. The valve is equipped with a smooth running spring and a rubber gasket that create an