Non-Return Valve for Extractor Fans

Non-return valve with two folding slats (very light so very little resistance) that open when there is air displacement by a fan.

They ensure that the air flows in one direction only, but at the same time do not adversely affect fan capacity in a significant way.

This valve can be installed in a spiro tube or plastic channel (valve is slightly smaller in diameter so it can be slid into the tube and then has to be fixed with glue/sealant or tape).

Application:

This non-return valve can be installed behind ventilators that can not bridge much resistance, so the valve is suitable for various bathroom fans.