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Gas water heater Boiler air strain swap In theory, the smaller the pa price of the air strain switch, the extra sensitive the air pressure switch is. If the machine makes use of the fan for an extended time, there will be sure dirt impurities in the chimney. If the pressure cannot be reached, the air pressure swap won't work. When replacing a brand new air strain switch, it's endorsed to come to a choice a smaller one than the unique pa, and in addition examine whether or not the venturi tube associated with the air pressure activate the fan is burned out.