Potterton air pressure switch is a safety device which checks that the fan is fully operational. It ensures that, if the fan fails within the boiler, there will not be a build-up of noxious gases with no means of diverting them out of the property.
Fits a number of Potterton appliances
Technical specification
TypeAir Pressure SwitchCompatible WithPotterton FF 55, Potterton Profile 40 EL and Potterton Profile 60 ELManufacturer Model No5105884Brand NamePotterton