The xpelair simply silent dx150ts is a 150mm two speed extractor fan with a traditional grille style fascia finished in cool white it is suitable for a wide range of applications including larger bathrooms utility rooms and kitchens 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 of 30s to 30 minutes when the