This part is located around the fan section. The fan is the part that pushes fresh air in to the combustion chamber, allowing the gas to be burnt correctly. It also extracts the noxious gas after the combustion process is complete. The boiler has safety protocols in place to make sure no gas can be passed through to the main burner if the fan has stopped working .
Fits multiple appliances
Technical specification
Waist Sizead72ch57fwToilet Cistern CapacityFTW--Supplier Part Number20023931Brand NameVaillant