Preventative maintenence inspection on 1993 Janitrol furnace running in good condition despite its age. Replaced air filter with new one supplied by Kathy. Cleaned flame sensor and checked ignitor. Visual inspection of burners. Tested blower motor capacitor. Test ran system in heating mode from thermostat. Delta t of 54F with supply temp of 121F, spec 40-70F. Blower motor and inducer motor running within spec. Galvanized B-vent in good condition and no sign of leaks. 0PPM CO detected during testing. Replaced batteries in thermostat and basment CO detector. System is operating properly, efficiently, safely and ready for Winter.