In message , Graham. writes
I stayed in a Premier Inn last year and an occupant of another room was smoking, presumably in the bathroom and using the extractor to take the smoke away. The only problem was that the system was naff and some of the smoke was ducted back into my bathroom, unless my extractor was on too. Looking at the roof it seemed as though about 8 rooms all shared the same vent pipe.
I complained to the "Manager" and was told that I was imagining it, or trying to make excuses for my own smoking in the room!! The reason being that each room had its own fan and that they were not interconnected. I said about the smoke being blown back down the ducting and was told that it didn't exist, "the fan is just attached to the wall it doesn't have any ducting" at that point I gave up and we agreed to differ.
PS, my father, who is otherwise an intelligent guy, ran a 3KW fan heater off a rolled up extension lead. it never did un-roll again. :-(