4 Inch Duct Backdraft Damper, Manual Adjustment Airflow Volume Damper for Vents Fans Extractors Range Hoods Heating Systems

The stainless steel manual air valve can accurately control the flow rate and flow direction of the air flow in the ventilation duct to ensure stable and efficient operation of the ventilation system. Whether it is a factory workshop, a commercial building, or a residential fresh air system, it is necessary for its control over the circulation of the air.

Specification  
Color: Silver;
Material:304 Stainless Steel;
Outer Diameter: 20 mm / 0.8 inch;
Inner Diameter: 17 mm / 0.7 inch;
Thickness: 1 mm / 0.04 inch;
Length: 100 mm / 3.94 inch;
Packing List: 1Pcs Duct Backdraft Damper

Advantage
1. The main body is made of 304 stainless steel, which boasts excellent anti-rust and corrosion resistance. The duct damper can effectively withstand moisture, acid, alkali and other corrosive factors, adapting to various complex environments.
2. Manual operation method, by rotating the handwheel or handle, the air volume can be flexibly controlled, without the need for complex electronic control equipment, making it convenient for staff to make quick adjustments.

Instruction
1. Select an air valve with the adaptive specifications according to the diameter of the ventilation pipe. After cleaning the connecting parts of the pipe, use flanges and bolts to closely connect the air valve to the pipe to prevent air leakage.
2. Turn the handle clockwise to reduce the air volume and close the valve plate, and rotate counterclockwise to increase the air volume and open the valve plate.

Note
Please avoid high temperature, flammable and explosive environments to install and reserve sufficient maintenance space.