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Wet zone? Fan position is above a window opposite the shower (over bath). Bathroom prob 3m by 2m, and the fan is as far from shower as possible.
Currently have (what I assume to be a very basic) manrose - 4",so would like to use the same hole without having to enlarge. Looking at this, is it going to offer any significant improvement? http://www.gil-lec.co.uk/silent-tornado-st100b-bathroom-extractor-fan
owl
@rive_gauche
depends on: is the fan position in a wet zone? volume of room? silent? timer? slimline? ducted in-line?
bathroom extractors are typically 100mm (4"), but if you wanted to really clear the room, fitting a 150mm (6") could be a good idea.
xpelair, manrose/vent-axia, pretty standard brands