These are fitted to the boilers to ensure all the burnt products such as carbon monoxide CO is removed from the Saunier Duval boiler to the outside safely. The fan also brings fresh air'Oxygen'into the boiler to enable the boiler to burn the gas safely. The fan receives its voltage and is driven directly from the printed circuit board which also control the complete boiler.
These Saunier Duval fans come in two categories:
- The first category being a 240V driven fan, these fans were fitted to the older non condensing boilers and only have 1 speed, so they are either on or off.
- The second category being a DC driven fan, these fans are fitted to the newer energy efficient boilers and can have their speeds varied and regulated via the printed circuit board pcb.