EE Gads--from my childhood-one of the houses we lived in had a heater-furnace like that Bryant!Was in the basement-would look thru the grates on the side cover and see the burners start.and hear the fan start after the heat exchanger warmed up.Of course the blower was muffled from the cover.As I type this trying to remember what house it was in-was rather little at the times.Yes,that Bryant is a quality peice of equipment.Too bad they don't build them like this one anymore!