100mm Non-Return Valve, Silent Galvanized Steel Ventilation Connection with Automatic Cooker Hood Non-Return Valve - Rubber Seal, Duct Fitting for Ventilation Duct

About this product: The cooker hood backdraft damper is very robust and durable. The housing is made of galvanized steel, and the damper blades are made of aluminum. Two stainless steel springs and a rubber ring ensure a 100% seal and quiet operation when the extractor fan is not running. Suitable for all common round ventilation ducts and flexible hoses according to DIN EN 1506. FUNCTION: The duct connection with a backdraft damper prevents the return of extracted air or the entry of cold outside air. The flaps open when the fan blows the exhaust air outside and close automatically as soon as the airflow stops. The flaps must be aligned horizontally for optimal closure. Versatile and applicable to all air supply and exhaust systems, such as air conditioning systems, dryers, range hoods, and ventilation systems, e.g., odor traps, bathroom ventilation. Perfect choice for both hobbyists and professionals. The smooth-operating flaps can also be opened by small fans.