Copkim 4 Pcs Backdraft Damper One Way Airflow Dryer Vent Backflow Preventer Duct Draft Stopper Inline Fan Vent Deflector with 2 Spring Loaded Folding Blades for Range Hoods Bathrooms Kitchen (4 Inch)

You Can Get: with a package that contains 4 pieces of 4 inch backdraft dampers, it caters to a comprehensive, easy user experience; This bundled package makes it easy to replace or install multiple dampers in different locations at the same time, thereby saving time and effort Quality Material Composition: 4 inch duct reducer is made from galvanized steel that offers durability to withstand different conditions, ensuring longevity; Additionally, the leaflets are made of aluminum, and the shafts and springs are manufactured with stainless steel, ensuring impeccable performance and consistency, and can withstand temperatures from 14 to 140 Fahrenheit Celsius Size for Versatile Use: air duct damper sports a convenient size with a diameter of approximately 3.9 inches and a height of roughly 3.46 inches; Crafted to fit 4 inch ducts well, it proves its versatility in various duct systems, encouraging more airflow for efficient use Features for Effective Performance: besides its robust material composition, the 4 inch duct reducer's functionality is amplified with its one way, 2 spring loaded folding blades; This allows for maximum air balance, ensuring uninterrupted air flow in the desired direction while preventing the reverse; It can be inserted into flexible or non flexible ventilation ducts; Due to different sizes, can not be applied with plastic piping Easy to Use: push the vent blocker into the ventilation pipe to the end to install; When the baffle is installed horizontally, the position of the spring should be in a horizontal position so that it can be opened and closed in an optimal way; The flap opens under the pressure generated by the airflow, then it closes automatically under the action of spring; The return damper closes automatically when the air volume is low
Features:
This dryer vent backflow preventer is ideal for various occasions and places. From maintaining home heating, ventilation, and air conditioning systems to managing airflow in industrial settings, the damper's adaptability is invaluable.
Duct damper has smooth running springs and internal foam strips to prevent blade rattle and can be mounted horizontally or vertically.

Specifications:
Material: galvanized steel, aluminum, and stainless steel
Color: silver
Size: approximately 3.9 inches in diameter and 3.46 inches in height

Package includes:
4 x Backdraft damper

Notes:
Manual measurement, please allow slight errors on size.
The color may exist a slight difference due to different screen displays.