The xpelair simply silent dx100bts is a two speed extractor fan which has a conventional grille style fascia finished in cool white it is suitable for a wide range of applications including bathrooms shower rooms and toilets including zone 1 and 2 installations the fan meets buildings regulations part f and has a timer control which means that when connected to a remote switch such as a lighting circuit the fan will turn on when the circuit is switched on and will overrun for a selectable time o