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Non-return valves for ventilation let air flow in one direction only – from the room to the outside. When the fan stops, the shutter closes and stops cold air, odours and dust coming back. We offer plastic non-return valves (EKO Ø100, 125, 150 mm) and galvanised steel non-return valves for ducts, bathroom fans, extractor hoods and heat recovery units. Read more at the bottom of the page
For extractor hoods and heat recovery units choose galvanised steel AV or AVGI; for bathroom and kitchen fans with plastic ducting choose the plastic EKO non-return valve. Seal joints with self-adhesive PVC tape. Items in stock ship within 2–7 days outside Lithuania.
It lets air pass in one direction only. When the fan is off, the non-return valve closes and stops cold air, odours and dust returning through the duct.
The EKO series for low and medium pressure fans: EKO-22 Ø100, 125 and 150 mm for plastic ducts, or EKO-27/22 with a wall plate.
Galvanised steel AV or AVGI, made for medium and high pressure fans such as extractor hoods and heat recovery units.
EKO are plastic shutters for low and medium pressure fans. AV and AVGI are galvanised steel shutters for medium and high pressure fans.
For AV the duct must be cut because of the protruding axle. AVGI fits inside the duct, so no cutting is needed.
Match the duct diameter. EKO plastic shutters come in Ø100, 125 and 150 mm, and 55×110 mm for flat rectangular ducts.
