Fan blower motor of Bryant furnace keeps running after flame is off
Furnace blower fans will continue to run for a bit after the flame shuts off to strip the remaining heat from the heat exchanger and bring it into the rooms the furnace is heating.

Think of it this way - the gas valve (the flame) is controlled by the thermostat, but the blower is controlled by a sensor mounted in the heat exchanger. If the heat exchanger temperature falls within a certain range the blower will run to make use of that heat. You will also notice that the flame will run on its own upon startup without the blower for a short period until the heat exchanger warms up enough to justify running the blower over it and delivering heat.