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

ASIN	B004X4RVUQ
Air Flow Capacity	7329.6 Cubic Centimetres Per Second
Best Sellers Rank	1,955 in DIY & Tools ( See Top 100 in DIY & Tools ) 4 in Registers, Grilles & Vents
Brand	Kair
Colour	White
Controls Type	Motion Sensor
CountryOfOrigin	United Kingdom
Customer Reviews	4.5 out of 5 stars 3,756 Reviews
Filter Type	Filterless
Finish Type	Painted
Global Trade Identification Number	05060272540890
IncludedComponents	Non-return shutter flaps, 4 inch / 100mm round male spigot
Item Dimensions D x W x H	10.2D x 39.4W x 15.5H centimetres
Item Form	Pyramid
Item Weight	0.18 Pounds
Item height	15.5 centimetres
Manufacturer	Kair
MaterialType	Polypropylene (PP)
Model	SYS-100
Mounting Type	Wall Mount
Number of Speeds	1
SpecialFeatures	Automatic Non-Return Shutters
Unit Count	1.0 Count
Vent Hood Design	Wall Mounted Canopy Hood
Ventilation Type	ductet

Kair White 100mm Gravity Wall Vent Grille - 99.5mm / 4 Inch Round Rear Spigot & 155mm Front Cover - Backdraught Prevention Shutter Flaps

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