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.

Manufacturer	Kair
Part Number	DUCMW124
Product Dimensions	16.51 x 16.51 x 5.99 cm; 358.34 g
Item model number	5060272541408
Size	125mm Extract
Colour	White
Material	Epoxy Coated Steel
Batteries included?	No
Batteries Required?	No
Item Weight	358 g

Kair Ceiling Extract Valve 125mm - 5 inch White Coated Metal Vent

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