10 Best Backdraft Shutter 150mm for 2026

List of Top Rated Backdraft Shutter 150mm from thousands of customer reviews & feedback.

Updated On August 2026 685 Reviews Studied By Customer Ratings

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neverest RK 150 mm In-line Backdraught Shutter Vent for Extractor Fans with Foam Sealed

neverest

Backdraft Nominal width 150 mm (6 inch) (exact dimensions see drawing), Galvanized steel housing, Flap leaves made of aluminum, Axis and spring made of stainless steel, Back draught valve for insertion into ventilation pipes, Reduces noise due to internal rubber seal
The backflow flap RK opens and closes automatically. It has a smooth-running spring and should therefore be installed horizontally or vertically only as an exhaust air flap.
The damper blades open even at low air flow. The inner sound insulation strip prevents loud rattling when striking the damper blades.
Backflow flaps prevent the ingress of cold air or wind through the ventilation pipe. Here, the flap is installed so that the damper blades open only in the outflowing air direction. This means that no (cold) air / wind can penetrate from outside through the ventilation duct.
INSTALLATION: The backflow flap is installed by inserting it into the ventilation pipe until it stops. The position of the spring should be horizontal for horizontal installation of the flap so that it can open and close optimally.

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Kair Cowled External Vent 150mm - 6 inch Stainless Steel Grille with Backdraft Shutter to Protect Against Insects and Wi...

Kair

Stainless steel external vent with 145mm spigot for use with 150mm ducting systems
Superior alternative to plastic cowls and grilles with integral back draft shutter for protection against insects and unwanted sounds
Ideal for both domestic and commercial extract applications.
Contains a weatherproof seal to eliminate leaks and drafts.
Ideal for venting tumble dryer, bathroom fans, air conditioning units, kitchen fans, electric dryers or cooker hoods.

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Ducting Pipe Non Return Valve 100mm Round Duct Rigid Tube Connector with Shutter Extractor Fan Backdraft Damper Stopper...

Awenta

Material: PVC plastic
Colour: white
Diameter: 100mm

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Ø 150mm / 6'' Extractor Fan Non Return Valve 150mm / 6inch Ducting Pipe

Europlast

Ø 150mm / 6 inch Non-return Valve for Extractor Fans
Backdraft Shutter
Non-return valves ensure that the air flows in one direction only
Simple operation works and silent unlike spring loaded vent valves
Made in EU

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Klimapartner RKI 150 - 6 Inch Backdraught Shutter Insertable Vent with Rubber Seal

Klimapartner

Back draught flap for insertion into ventilation pipe DN 150 (5 inch)The backflow damper RKI opens and closes automatically. It has a strong spring and can be installed either horizontally or vertically. The flap is suitable for retrofitting, since it is completely inside the duct.
A good sealing and fastening of the duct is achieved by the foam strip attached to the outside of the damper.The rubber sheath applied to the damper prevents loud rattling when the flap blades are opened. The housing of the flap is made of galvanized steel, the flap blades are made of aluminum, the axle and spring are made of stainless steel
Designed for use in AC, dryers, exhaust, extractor or range hoods, Heating, Vent and other residential, commercial and industrial HVAC applications
FUNCTIONALITY: Backflow dampers prevent cold air or wind from entering the ventilation pipe. In this case, the flap is installed in such a way that the flap leaves only open into the outgoing air direction. This means that no (cold) air / wind can penetrate the ventilation pipe from the outside.
INSTALLATION; The backflow valve is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation.

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Ducting Cowled Gravity Flap 150mm / 6" Outlet Cowl Air Vent Grille with Non Return Valve / Backdraft Shutter KO150-30

Awenta

Size: 150mm - size of the rounded wall hole part
EXTERNAL SIZE 250 x 250 mm
Ventilation cover for round ventilation systems; Material: plastic.

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Kair Connector with Backdraught Shutter 100mm - 4 inch Non-Return Damper Flap to Connect Duct Pipe or Flexible Ducting H...

Kair

100mm / 4 inch plastic ducting connector with inline backdraught shutter / gravity damper flap.
Stop smells and prevent cold air coming through your extract fan or ducting.
Will fit inside 100mm round pipe or 102mm flexible hose and can be used to join multiple lengths of pipe together to form a long duct run.
Perfectly suited for ducting your Tumble Dryer, Bathroom or Kitchen extractor fan, Hydroponics, In-Line Extract Fans, or Cooker Hood and other ventilation applications.
Genuine Kair product & covered by the Kair manufcturers 100% satisfaction guarantee for your peace of mind.

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Blauberg UK 6 inch 150 mm Metal Ducting and Fittings - in-Line Heavy Duty Back Draught Vent Shutter Damper - 150mm

Blauberg UK

Designed to provide anti back draught in a duct when our fan has been switched off.
A spring loaded butterfly action shutter acts as a barrier when there is no airflow.
Can be fitted in any position in circular ducts.
Also known as non return valves.

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