The Potterton fan gasket is situated around the fan portion. The fan is the element that brings fresh air into the combustion chamber, enabling proper gas combustion. After combustion is finished, it also gets rid of the burned gas. If the fan isn't working, the boiler has safety measures in place to ensure that no gas reaches the main burner.
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Technical specification
Product TypeGasketWaist Sizeab39ch14gxTypeGasketSupplier Part Number225154Brand NamePotterton