The fan is the mechanism that injects fresh air in to the combustion chamber, allowing the gas to be burnt correctly. It also extracts the remaining burnt 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 ceased functioning .
Square Outlet
Technical specification
Toilet Cistern CapacityFTW--Supplier Part Number432828Brand NameGlow-Worm
Reviews
Glow-Worm 432828 Fan Assembly Express/Swiftflow 75/80 Square Outlet