Large Xpelair extractor fan.
Think it is approx. 9" / about 20-25cm diameter.
Is has louvres - these face into the room, and when you turn it on the louvres are opened.
Switched on/off using a pull-cord.
It was working when it was removed, but - it is at least 25years old I think, possibly older!
Dusty - could use a clean - has been used in a bathroom.
Collect from Walton St, Jericho, OX1 2HQ one day next week tuesday onwards, daytimes only.
If replying, please make sure to suggest a couple of times when you would be able to collect