2005 Bryant Plus90i high efficiency furnace running in good condition despite age. 20x25x4 air filter in good condition. Clean flame sensor and check ignitor ohms. Visual inspection of burners. Flush condensation trap and drain lines. Run test unit in heating mode from thermostat. Temperature rise is within specs. Blower and inducer motors tested good. Pvc flue vents in good condition and no sign of leaks. 0PPM CO detected during testing. System is operating properly, efficiently and ready for Winter.