The xpelair simply silent dx100bs 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 product meets building regulations part f and has a standard 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 off when the circuit is switche