Preventative maintenence inspection on Trane furnace. 20x25x4 air filter in good condition. Clean flame sensor and check ignitor. Visual inspection of burners. Humidifier pad in good condition. Damper is open. Test run furnace in heating mode. 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. System is operating properly, efficiently and ready for Winter.