About This DIMENSIONS – Fits into Ø5 Inch round ducts; Insertion neck diameter: 4.88 inch. Total width: 3.54 Inch. Precision-engineered for a tight internal fit inside metal ventilation pipes for reliable, airtight performance. Damper has back pressure valve which is equipped with a spring-loaded split flap closure and allows airflow in one direction only, designed for use in air conditioners (AC), dryers, exhaust, extractor or range hoods, heating ducts, vents and other HVAC applications for kitchen, bathroom and other desired installation locations. INSTALLATION: The backflow flap is installed by inserting it into the ventilation pipe until it stops. The position of the spring should be horizontal for horizontal installations so that it can open and close optimally. The Backdraft shutter is installed so that the damper blades open only in the outflowing air direction. Back draft damper is made for insertion into various ventilation ducts which are flexible or non flexible / Installation in home, bathroom, kitchen, warehouse, industrial, office or any other areas where backflow needs to be regulated. Fits with all types of round ducts: sheet metal, flexible aluminum, plastic or fabric. The backflow damper opens and closes automatically. The flap is suitable for retrofitting, since it is completely inside the duct. The aluminum closing vanes open when overpressure occurs and close with the help of a spring when the pressure drops. To reduce operating noise, the pressure relief valve is equipped with an internal foam seal, which provides better sealing and quieter operation of the valve. Overview Color : Silver Material : Metal Brand : Repa Market Maximum Gap Fill : 5 Inches Number of Pieces : 1
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