Vent Systems 4 Inch Backdraft Damper Pack of 2 White Plastic OneWay Airflow Ducting Insert Easy Installation for Bathroom Kitchen HVAC Exhaust System Compatible with Round Ducts

FITS 4 INCH ROUND DUCTS Designed for 4 inch ventilation pipes ensuring a secure fit for both flexible and rigid duct systems plastic ducts or metal ducts flexible pipes and hoses Please check the size image for all product dimensions Ensures a secure and efficient airflow link DURABLE PLASTIC Made from quality impactresistant plastic with temperature resistance from 23F up to 140F The duct connector ensures longlasting performance in heating cooling and air conditioner ventilation systems Designed to provide anti back draught and fit in between Solid Plastic Ducting Flexible Ducting SECURE PUSHFIT DESIGN Male fit ends allow easy toolfree insertion Designed for use in a dryer vent exhaust extractor or range hoods heating systems fans vents and other residential commercial and industrial HVAC applications INTEGRATED BACKDRAFT DAMPER Please check installation images on how to properly install Duct draft stopper prevents cold air or wind from entering the ventilation pipe no cold air wind or smell can penetrate the ventilation pipe from the outside BACKFLOW SHUTTER INSTALLATION The backflow Preventer valve is installed by pushing it into the ventilation pipe as far as it will go The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally This also applies to the vertical installation VERSATILE HVAC APPLICATIONS The duct fitting is suitable for connecting two sections of HVAC ducting in heating cooling or ventilation systems for bathroom kitchen office or other indoor space The 4 inch duct connector is suitable for supply or exhaust air in a vent pipe.