PATIKIL 4 Inch Duct Backdraft Damper, 304 Stainless Steel Manual Adjustment Airflow Volume Damper for Vents Fans Extractors Range Hoods HVAC Ventilation Systems

Key Features

• SPECIFICATION: Color: Silver; Outer Diameter: 102 mm / 4 inch; Inner Diameter: 98 mm / 3.9 inch; Thickness: 1 mm / 0.04 inch; Length: 150 mm / 5.91 inch; Packing List: 1Pcs Duct Backdraft Damper
• FEATURE: 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.
• APPLICATION: This metal manual valve can accurately control the flow rate and direction of the airflow in the ventilation duct to ensure the stable and effective operation of the ventilation system. Suitable for exhaust fans, ventilation openings, circulation systems, etc. in bathrooms, kitchens, factories, and other places.
• NOTE: Please avoid high temperature, flammable and explosive environments to install and reserve sufficient maintenance space.
• INSTRUCTION: 1. Easy to install: Simply slide it directly into your ventilation pipe, and then use the pipe clamp and tape（not included） for a secure fit.In addition, you can weld the damper directly to metal ventilation pipes. 2.Position the air duct valve on accessible place and reserve sufficient maintenance space,turn the handle to adjust the air flow based on your requirement.