Back draught shutters

Non-return valves (back draught shutters) for ventilation

A non-return valve (check valve, backdraft damper) lets air flow in one direction only – from the room to the outside. When the fan is off, the valve closes and stops cold air, odours and dust from coming back. We offer plastic and galvanized steel non-return valves for ventilation ducts, bathroom and kitchen extractor fans, cooker hoods and heat recovery units.

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From 1.82 €

2.78 €

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Plastic back draught damper EKO-22, Ø100-125-150 mm

From 3.69 €

6.16 €

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Backflow valves AV, without gaskets

From 19.93 €

26.56 €

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Backflow valves to mount inside the duct AVGI

From 2.70 €

4.15 €

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Plastic back draught damper with wall plate EKO-27/22, Ø100-125-150 mm

From 2.81 €

4.31 €

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Plastic back draught damper for flat duct EKO-P-22

Types of non-return valves

EKO-22 – plastic valve Ø100, 125 and 150 mm for plastic ducts; used with low and medium pressure fans.
EKO-27/22 – with a wall plate, Ø100–150 mm.
EKO-P-22 – plastic valve for flat (rectangular) ducts 55×110 mm and Ø100 mm.
AV – galvanized steel valve for medium and high pressure fans (cooker hoods, heat recovery units); it has a protruding axle, so the duct must be cut during installation.
AVGI – galvanized steel valve with sealing gaskets; it is inserted inside the duct, no cutting needed.

How to choose

Choose by fan pressure and duct type. The EKO series suits bathroom or kitchen fans and duct fans with plastic ducts; AV or AVGI suit galvanized steel ducts, cooker hoods and heat recovery units. We recommend self-adhesive PVC tape to seal the joints.

Items in stock are delivered within Europe in 2–4 days and worldwide in 4–7 days. We will help you choose a valve for your duct size.

Frequently asked questions

What is a non-return valve used for in ventilation?

A non-return valve lets air pass in one direction only. When the fan is off, it closes and stops cold air, odours and dust from flowing back through the duct into the room.

Which non-return valve is best for a bathroom fan?

The EKO series is made for bathroom and other low and medium pressure fans: EKO-22 Ø100, 125 and 150 mm for plastic ducts, or EKO-27/22 with a wall plate. See also our bathroom fans.

What is the difference between EKO, AV and AVGI valves?

EKO valves are plastic, for low and medium pressure fans. AV and AVGI are galvanized steel valves for medium and high pressure fans (cooker hoods, heat recovery units). AVGI has sealing gaskets.

Do I need to cut the duct to install a check valve?

The AV valve has a protruding axle, so the duct must be cut. The AVGI valve is inserted inside the duct, so no cutting is needed.

What size of non-return valve should I choose?

Choose by duct diameter. The EKO plastic valves come in Ø100, 125 and 150 mm, and 55×110 mm for flat ducts. If in doubt, write or call us and we will help.

How fast are non-return valves delivered?

Items in stock are delivered within Europe in 2–4 days and worldwide in 4–7 days. The delivery time for AV valves is about 14 working days.

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From 3.05 €

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