Top 9 Non Return Vent UK – Registers, Grilles & Vents

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1. KB Tools

Rain and Wind Resistant Plastic Ventilation Ducting, Black, Cowled Duct Cover with Gravity Flap, Non-Return Vented Grill, Wall Mounted Heat and Air HVAC Vent

KB Tools - Cowled ac duct cover – designed to support exiting air in home or office ventilation systems, this HVAC duct cover helps release heat and air from dryers or bathroom and kitchen appliances to better protect your interior living space. Smart, springless design – offering easy installation, this ducting cover can be mounted and connected to your external port areas on the outside of your home with minimal effort, so you can replace old ducts or add in new external areas.

Expanded ventilation support – along with traditional use, positive input, air conditioning, passive ventilation, HVAC, this vent duct cover can be used for long ductwork including whole house ventilation systems, and heat recovery systems.

Enhanced outdoor protection – our air duct vent cover uses a closeable, non-return shutter flap and a cowled design to protect against water, wind, or rain from coming inside and to prevent air from flowing in reverse. Reduce odors and noise – these air and heat duct vent covers can also help with reducing unpleasant odors, loud noises, or high-temperatures from backing up into the house or flowing back into the duct for a cleaner, more comfortable environment.
BrandKB Tools
ManufacturerKB Tools
Part NumberBL100

2. SolaDirect

Ø 100 mm / 4 in Anti Backdraft Non-Return Pipe Connection White PVC Round Grille

SolaDirect - Lightweight. Quick and easy fit. Connector type: Round male fittings to fit inner of ducting pipe. 100 mm / 4 in ducting non-return valve. Equipped with a backdraft damper for backflow prevention. For use with the Round Pipe Ducting systems. Material: PVC. The connector fits into round pipe ducting to connect two lengths in a straight line. Colour: White.
BrandSolaDirect
ManufacturerSolaDirect

3. Armar Trading LTD

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

Armar Trading LTD - Brown air vent Cover with Gravity Flap. A-250mm, b-116mm, c-165mm, Ø- 150mm length Of Flange 20mm. Simple To Fit. High quality ABS Plastic. Comes with 4 fixings and 4 Screw Cover Caps.
BrandArmar Trading LTD
ManufacturerArmar Trading LTD
Part Numbersdgf132HBN

4. Klimapartner

Klimapartner HWG 150, Cowled External Extractor Wall Vent Cushioned Non Return Flap

Klimapartner - Exhaust weather guard made of brushed stainless steel. For wall mounting, with rubber seal and 4 stainless steel screws. Prevents cold air exposure thanks to flap lock. For high air currents see product description. For installation in ventilation pipe bore diameter 150 mm inner diameter 145 mm.
BrandKlimapartner
ManufacturerKlimapartner
Height18.5 cm (7.28 Inches)
Length14.5 cm (5.71 Inches)
Weight0.5 kg (1.1 Pounds)
Width18.5 cm (7.28 Inches)
Part Number4054503006089

5. Boomerangg

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

Boomerangg - Made from high quality ABS Plastic. Exhaust grilles with backdraft damper, Easy To Fit. Size: 150mm - size of the rounded wall hole part. Ventilation cover for round ventilation systems. External size 250 x 250 mm.
BrandBoomerangg
ManufacturerBoomerangg
Part NumberKO150-30

6. Armar Trading LTD

Details About Ducting Cowled Gravity Flap Outlet Cowl Air Vent Grille with Non Return Valve 125mm, White

Armar Trading LTD - Comes with a built-in anti back draught shutter blade easily removable if Not needed. This grille is perfect for DIY and Trade use and provides superior airflow performance and durability. The ducting flap can be closed to help reduce unpleasant odours, noises, or draughts flowing back through your duct. The cowl grille is used for cooker Hood, bathroom, toilet, kitchen ventilation fans & tumble dryer extract. The gravity flap is stylishly covered by the square shape cowl and in doing so, offers more of an aesthetic appearance than most traditional plastic grilles.
BrandArmar Trading LTD
ManufacturerArmar Trading Ltd

7. SolaDirect

White Gravity Grille 125 mm / 5 inch External Ducting Air Vent with Round Spigot and Non-Return Gravity Shutters for Kitchen Ceiling Extractor Fans Bathroom Ventilation Duct Fan Cover

SolaDirect - Gravity operated flaps that close when not in use. Non-return shutter flaps close automatically when not in use. Gravity flap - no need for springs that could break. Easy to install, just push-fit duct and fittings together.

190 mm x 190 mm plastic ducting air inlet / air outlet with gravity shutters - 5 inches / 125 mm round male spigot on the back of the grille for indoor or outdoor use. Designed to terminate your extract duct to an external wall. Perfectly suited bathroom or kitchen extractor fan, hydroponics fan, or in-line extract fan. Stops unpleasant odours, noises, or draughts flowing back through your duct. This grille can be used as a part of a long ductwork run for a variety of purposes including whole-house ventilation, air conditioning, passive ventilation, HVAC, positive input, and heat recovery systems.
BrandSolaDirect
ManufacturerSolaDirect
Part NumberTN4/Sola

8. Armar Trading LTD

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

Armar Trading LTD - Size: 150mm - size of the rounded wall hole part. Ventilation cover for round ventilation systems; Material: plastic. External size 250 x 250 mm.
BrandArmar Trading LTD
ManufacturerArmar Trading LTD
Part Number979c

9. LIRAST

Ø 125mm / 5'' Brown Plastic Ventilation Grille with Non-Return Gravity Shutters, Air Vent Cover with Insect Protection

LIRAST - When the extractor fan or ventilation System is not in Use, The Grille Shutter Flaps Close Automatically. Ventilation grille for installation into Wall or Ceiling // Suitable for Internal or External Use // Equipped with Anti-Insect Mesh. Easy to install - equipped with Round Spigot Ø 125mm / 5''. Made of abs plastic - weather and uv resistant // External Dimension: 190x190mm / 7. 5x7. 5''. Non-return shutters designed to Protect Your Ventilation Duct From Unpleasant Odours, Noises or Objects.
BrandLIRAST
ManufacturerLIRAST