Installation was a bit more difficult than anticipated because the required cut out is not circular: although mostly it is a 240mm diameter hole, there is a sector with a bigger diameter (ca. 250mm). Soon sorted (1920s lath and plaster ceiling) but more work than a straight swap for the existing fan (240mm diameter hole). Very happy with the finished fan, however, which works very well extracting air from a high-ceilinged shower room and is wonderfully quiet. Recomended.
