I've a bathroom, including shower cubicle, that's about 4.3m x 2.8m x
2.8m. There's no extraction so it gets kinda steamy...Doing the calculations:
Room volume is roughly 34 cubic metres.
General google-style advice suggests something like a 15x air change per hour for a bathroom with shower... giving around 500-600 m^3/hr extraction.
That sounds kind of big, compared with the 100/150mm fans that screwfix et. al have.
Do I _really_ need such a large fan? Or will something more standard do?
AJB.