Preventative maintenence inspection on Trane high efficiency gas furnace. 20x25x4 air filter in good condition. Clean flame sensor and check ignitor. Visual inspection of burners. Flush condensation trap and drain lines. #35 humidifier pad in new condition. Turned on water supply and partially opened damper to limit air flow. Test ran furnace in heating mode from thermostat. Temperature rise is within specs. Blower and inducer motors tested good. 3" pvc flue in good condition and no sign of leaks. 0PPM CO detected during testing. Humidifier tested during heating mode test. Furnace is operating properly, efficiently and ready for Winter.