2019 Goodman high efficiency furnace running in great condition. 20x25x1 air filter in good condition. 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 53F with supply temp of 122F. Blower motor and inducer motor running within spec. 3" pvc flue in good condition and no sign of leaks. 0PPM CO detected during testing. Furnace is operating properly, efficiently and ready for Winter.