The air pressure switch is a safety device which checks the fan is fully operational. It ensures that, if the fan stops working within the boiler, there would not be a build up of toxic fumes with no means of extracting them safely.
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Technical Specifications
TypeWater Pressure SwitchToilet Cistern CapacityFTW--Supplier Part Number59015LABrand NameRadiant
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Radiant 59015LA Water Pressure Switch PC5411 1/8 Latest