Perform preventative maintenence inspection on 1999 Bryan standard efficiency furnace running in good condition despite age. 16x25x4 air filter is in new condition. Clean flame sensor and check ignitor. Visual inspection of burners. Check humidifier pad. Test run operation of furnace in heating operation. Initial startup shows an unusual noise from the inducer motor. Suspect that the jnternal bearings are starting to fail. Inducer motor should be replaced sooner than later to avoid a non operational emergency. Quote for inducer motor will be emailed over. While operational, all other aspects of the system tested withing specifications. Blower motor, temperature rise, and gas valve are all good. No issues other than the inducer motor where found or suspected and system is currently operational.