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Doing gas furnace tune-up on Lennox residential upflow 80% afue rating gas furnace in attic of home. Checked flu pressure switch for inducer motor as well as amp draw on inducer motor as well as blower motor amp draw readings to ensure run load amperage is correct within parameters of manufacturer specifications also checking run capacitor for proper capacitance readings reading 4.83 microfarads for the 5 microfarad 440 volt run capacitor appears to be working in normal operating condition