The xpelair simply silent c4s is a two speed extractor fan with a sleek smooth finish 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 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 switched off the simply silent c4s uses unique innovati