Performed heating maintenance on a 2003 Bryant single stage 90% efficient natural gas furnace Pulled condensate trap and flushed with water Pulled and cleaned flame sensor 16x25x1 is in shape Blower in OK condition Run tested furnace Performed combustion test: readings are still in a fantastic operating range Gas pressure 3.2 Temp rise 65⁰ Despite age, furnace is still operating well within factory specifications