Pack of 2 Automatic Non-Return Valves, 150 mm Non-Return Valve with Sealing Rubber Gasket for Cooker Hood and Ventilation Duct

[One-Way Airflow]: Two semi-circular deflectors open and close automatically, leaving only one one-way switch, so that airflow can only circulate in one direction, preventing air from flowing back into the ducts, which causes backflow and effectively ensures unidirectional air circulation.

[One-Way Airflow Restrictor]: When the indoor pressure is lower than the outdoor pressure, airflow is restricted and the air damper closes automatically, effectively preventing the intrusion of outside noise, birds, rats, rain, and insects.

The baffle must be oriented horizontally for optimal closure.

[Rubber Seal]: The internal rubber seal not only provides a better seal for the non-return valve's operation but also reduces noise during use and makes the non-return valve more durable.

[Easy to Install]: When installing the non-return valve, it should be pushed into the ventilation duct so that it moves as far as possible. If the valve is installed horizontally, the spring must be positioned horizontally so that the valve can open and close optimally. The same applies to vertical mounting.

[Wide Range of Applications]: The valve is designed for use in all air supply and exhaust systems such as air conditioners, dryers, extractor hoods, and ventilation systems. This non-return valve can be used in flexible or non-flexible ventilation ducts.