Preventative maintenence Inspection on Bryant high efficiency furnace running in great condition. 20x25x1 air filter is new today. Old filter was filthy and in backwards. Drew arrow above filter door to eliminate confusion. Clean flame sensor and check ignitor. Visual inspection of burners. Flush condensation trap and drain lines. Run test unit in heating mode. 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. System is operating properly, efficiently and ready for Winter.