Preventative maintenence inspection on Trane standard efficiency gas furnace running in great condition. 20x25x4 air filter in decent condition. Check again in 1-2 months. Humidifier pad is new today. Clean flame sensor and check ignitor. Visual inspection of burners. Run test unit in heating mode. Temperature rise is within specs. Blower and inducer motors tested good. Galvanized B-vent is in good condition and no sign of leaks. 0PPM CO detected during testing. Test ran humidifier operation. All systems are operating properly, efficiently and ready for Winter.