Hon&Guan 4 Inch Backdraft Damper, One-Way Airflow Duct Damper 4 Inch Ducting Insert Backflow Preventer Duct Draft Blocker.

The Backdraft Shutter is a lightweight and durable solution for improving ventilation in your home.

Made of high-quality materials, including galvanized steel, aluminum, and carbon steel, this product ensures optimal performance and longevity.

With its easy installation method and wide range of applications, the Backdraft Shutter is perfect for use with range hoods, bathroom fans, kitchen appliances, and other home HVAC systems.

The valve wings open under airflow pressure, automatically closing when the air flows in the opposite direction, ensuring a smooth and quiet operation.

Additionally, the rubber ring ensures 100% closure, providing complete protection against backdrafting.

Don't miss out on this excellent product that can greatly improve your home's ventilation system!