which size of the screw should be used for fixing to ceiling ?

I would glue they fit well if you cut the right size hole

What is total micemebt

Sorry, don't understand 'micemebt. I found the unit to be well made and not too obtrusive. However, I couldn't fins a way to adjust the inner control disc from below. I could only adjust it from above, which for me is in the loft. I could be missing something. I also bought back draft flaps which I put in line on the exhaust side of the fan. This stops unwanted draft coming in on windy days.

Tried to install today, and I'm stuck. How do you secure the white white metal collar to the steel duct? It just falls straight through

There's a twisting motion to secure to an internal shallow thread if I recall. Then the centre bit can rotate against a screw/nut to enlarge or shrink the hole/gap.

Does this require a fixing collar?

I didn't use one, the 100mm hole was tight enough that it didn't need one

Kair Ceiling Extract Valve 100mm 4 Inch White Coated Metal

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Description

🌬️ Elevate your air game with sleek, silent, and smart ventilation!

SEAMLESS INTEGRATION - Flush-fit design with a sleek white powder-coated finish that complements modern interiors.
DURABLE BUILD QUALITY - Constructed from epoxy-coated steel with a galvanised mounting ring for long-lasting performance.
UNIVERSAL COMPATIBILITY - Fits standard 100mm round pipes and 102mm flexible hoses for versatile installation.
WHISPER QUIET OPERATION - Engineered for silent extraction, ideal for maintaining peaceful, comfortable spaces.
PRECISION AIRFLOW CONTROL - Easily adjust and lock airflow with a smooth rotating disc for perfect ventilation.

The Kair Ceiling Extract Valve is a high-quality, white powder-coated metal vent designed for adjustable ceiling air extraction. Compatible with 100mm round pipes and 102mm flexible hoses, it features a rotatable control disc for precise airflow adjustment and a durable epoxy-coated steel construction. Its flush, wipe-clean design fits seamlessly into modern interiors, ensuring quiet and efficient ventilation compliant with Part F Building Regulations.

Specifications

ASIN	B004X4RKL6
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	19,572 in DIY & Tools ( See Top 100 in DIY & Tools ) 418 in Bathroom Hardware
Colour	White
Customer Reviews	4.4 4.4 out of 5 stars (279)
Date First Available	19 April 2011
Item Package Quantity	1
Item Weight	259 g
Manufacturer	Kair
Manufacturer reference	DUCMW104
Material	Epoxy Coated Steel
Part Number	DUCMW104
Product Dimensions	14.5 x 14.5 x 5.99 cm; 258.55 g
Size	100mm Extract

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