DIRBUY 2 Pack Backdraft Damper - 6 Inch One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades - Silver Vent Blockers - Backflow Preventer for 6 Inch Duct Dryer Vent Hose, Range Hoods

Additional Details from the Manufacturer

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• Package and Dimensions: You receive a set of 2 backdraft damper, each with a diameter of 5.9 inches (150 mm), a length of 3.46 inches (88 mm), and a thin profile of 0.02 inches (0.5 mm). They are designed to withstand temperatures up to 100 °C.
• Material: Constructed with precision, the 6 inch duct features a galvanized steel body, aluminum damper blades for lightness and durability, and stainless steel for the shaft and spring to ensure longevity. Please note that all dimensions are approximate due to manual measurement and may vary by 1-3 mm.
• Installation: For optimal performance, The vent blockers are installed by pushing it into the ventilation pipe as far as it will go. It comes with a spring-loaded split damper closure device that facilitates unidirectional airflow. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation.
• Function: This back flow preventer valve is strategically placed on the TD lip to open under the pressure of airflow and close automatically with the spring's force when air flows in the opposite direction, effectively preventing air recirculation and enhancing ventilation efficiency when the fan is off.
• Wide Application: Versatile for use in both flexible and rigid HVAC air ducts, these dampers are suitable for a variety of applications including air conditioners, exhaust fans, range hoods, heating ducts, and vents across residential, commercial, and industrial settings.