It's a 100mm extractor fan. I'm giving this away because I've replaced my fan with a Unity CV3 fan instead.
It fundamentally works. I've just upgraded to something that's a trickle extractor fan instead of these ones that come on when the lights come on.
These still work pretty well, but I need the one that I've upgraded to instead, because I'm working towards a PassivHaus
Happy to drop it off if not far too
Single-Speed
Noise Level 41dBA at 3m
Wall-Mounted
Ducting Not Included
No Built-In Shutter
Adjustable Overrun Timer: Max. 20min
Extraction Rate 85m³/hr