A furnace blower motor is a part that circulates air across the heating and cooling components of your HVAC system and through the ductwork into your home. The principal heating component in this process is the heat exchanger. In the cooling process, the principal component is the evaporator coil.
The blower motor works essentially the same way whether your furnace runs on oil, gas, electricity, or a combination of fuels. If the motor malfunctions or breaks, your furnace may fire up and then shut down, or it may not operate at all. This is usually a sign that you need a blower motor repair or replacement.