Vrbgify 2 Pack Four Inch Backdraft Damper Duct One Way Airflow Draft Stopper for Dryer Range Hoods Bathroom Fans and Kitchen Ventilation

This package includes two backdraft damper ducts each with a diameter of four inch a height of three point five inch and a thickness of zero point zero two inch designed to fit four inch duct openings and ensure compatibility with your ventilation system.

Constructed with galvanized steel housing and equipped with inner rubber gaskets the damper provides a durable airtight seal that prevents air leaks and maintains efficient airflow control in your ductwork.

Installation is straightforward simply insert the backflow preventer into the ventilation pipe ensuring the spring is positioned horizontally for optimal opening and closing performance suitable for both horizontal and vertical duct setups.

The backdraft shutter allows airflow only in the outgoing direction preventing cold air wind or unwanted drafts from entering your ventilation ducts thereby improving indoor air quality and energy efficiency.

Ideal for use with dryer vents air conditioning exhaust fans extractor hoods heating systems and various residential commercial and industrial HVAC applications to maintain proper ventilation and prevent backflow.

Designed for reliable performance this backdraft damper helps avoid buildup of toxic fumes and unwanted odors by allowing air to flow out while blocking reverse airflow keeping your living or working space safe and comfortable.