neverest® RKI 4" Inline Backdraft Damper, One-Way Airflow Check Valve

Additional Details from the Manufacturer

This item information is coming from the manufacturer. Some of the details may vary from the Nellis Auction listing. Please check the Quality Rating and Notes for information specific to this listing

More features

• ONE-WAY AIRFLOW CONTROL: This passive inline check valve allows air to exit while automatically blocking outside air from entering. Perfect for stopping cold drafts, odors, and backflow in your home’s 4-inch ventilation ducts.
• AIRTIGHT GASKET SEAL: Features a high-quality internal rubber gasket and foam padding. Unlike standard dampers, the RKI ensures a tight seal to maximize energy efficiency and prevent annoying "whistling" noises from air leakage.
• REINFORCED SPRING-LOADED BLADES: Equipped with a strong internal spring that keeps the aluminum flaps closed when not in use. The shutter opens smoothly under pressure from your exhaust fan and snaps shut instantly when airflow stops.
• SILENT OPERATION: Designed with noise-dampening foam strips to prevent the aluminum blades from rattling or clanging against the housing. Enjoy quiet ventilation even in windy conditions or high-pressure systems.
• EASY INLINE INSTALLATION: The galvanized steel housing fits snugly inside any standard 4-inch (100mm) circular duct. Ideal for upgrading existing dryer vents, kitchen range hoods, bathroom fans, and HVAC systems.