Preventative maintenence inspection on Trane XT80 furnace running in great condition. Trane Clean Effects filter cleaning. Clean flame sensor and check ignitor. Visual inspection of burners. Test ran in heating mode from thermostat. Temperature rise is within specs. Blower and inducer motors tested good. 4" galvanized B-vent in good condition and no sign of leaks. 0PPM CO detected during testing. Furnace is operating properly, efficiently and ready for Winter.