I am fitting a new shower to a downstairs bathroom (the room previously only have toilet & sink) and need to fit an extractor fan. The room borders onto an enclosed porch (uPVC doors & windows with sloped tiled roof above).
I could fit the fan near the ceiling and put the ducting through the wall into the porch then vertically through the roof to exit via a chimney in the tiled roof. This is the expensive and more invasive option.
What I would like to know is if it's possible/practical is to fit the extractor to just above the skirting board and have the duct go round the floor of the porch. I understand that hot air rises etc, but what I don't know is whether that really makes much difference if the fan can replace the air in the room sufficiently quickly.