Is the 10cm the size of the 'flaps' or the width of the whole unit?

the size is not applicable to either of the above , it refers to the size of ducting you can attach to the grill tohere is the actual sizes for the gravity grill 100mm / 10cm Product Type Wall VentHeight (mm) 155Length (mm) 155Width (mm) 40Spigot size (mm) 28 x 96 x 96

Does anyone know if when the extractor is on are the flaps meant to open up? Mines doesn’t seem to open up at all.

Assuming the extractor fan is blowing out through the grille, the flaps should open. How far they open depends on the strength of the air-flow from the fan.

What is the pitch of the fixing holes, looking for 110mm horizontal by 100mm vertical.

The fixing holes on this product correspond to the measurement you are looking for 110mm wide between securing holes x 100mm high between securing holes

Has anyone used this on an plastic outdoor keter shed?

should be fine with a suitable interface sealant

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🌟 Elevate your air game with the Kair White Gravity Grille — where smart design meets silent efficiency!

PLUG PLAY INSTALLATION - Push-fit ducting means no fuss, no tools—just quick, professional-grade setup.
SLEEK SPACE SAVVY DESIGN - Compact 155mm x 155mm profile fits seamlessly into any modern ventilation setup.
EFFORTLESS AIRFLOW MASTERY - High-capacity 7329.6 cc/sec airflow keeps your space fresh and breathable.
SMART ODOR NOISE BARRIER - Automatic gravity shutters block unwanted smells and sounds without a single spring to fail.
REGULATION READY PERFORMANCE - Complies with Part F Building Regulations and tested by BSRIA/BRE for trusted quality.

The Kair White Gravity Grille is a high-performance, energy-efficient ventilation solution featuring a 155mm external dimension and a 100mm rear spigot. Its automatic non-return shutter flaps prevent backflow of odors, noise, and drafts without relying on fragile springs. Designed for easy push-fit installation, it supports a robust airflow capacity of 7329.6 cc/sec and meets stringent Part F Building Regulations, making it ideal for bathrooms, kitchens, HVAC, and whole-house ventilation systems.

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Anita G.

Good experience, but the tracking updates could be better.

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Air flow capacity	7329.6 cc/sec
Material	Polypropylene (PP)
Mounting type	Wall Mount
Included components	Non-return shutter flaps, 4 inch / 100mm round male spigot
Controls type	Motion Sensor
Number of speeds	1
Item weight	82 g
Filter type	Filterless
Item form	Pyramid
Ventilation type	exhaust
Vent Hood Design	Wall Mounted Canopy Hood
Manufacturer	Kair
Global Trade Identification Number	05060272540890
Part Number	DUCVKC243
Product Dimensions	15.5 x 4 x 15.5 cm; 81.65 g
Item model number	SYS-100
Finish	Painted
Item Package Quantity	1
Special Features	Automatic Non-Return Shutters
Batteries included?	No
Batteries Required?	No
Item Weight	81.6 g

Kair White Gravity Grille 155mm External Dimension Ducting Air Vent with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters

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