What is the role of the induced draft blower in a furnace system?

What is the role of the induced draft blower in a furnace system?

• A. To push cooled air into the living space.
• B. To filter contaminants from the combustion air.
• C. To ignite the fuel mixture.
• D. To force combustion products through the heat exchanger and vent to chimney or sidewall vents.

Answer: (D)

The induced draft blower is part of the furnace’s exhaust path. Its job is to create a controlled draft that pulls the combustion products through the heat exchanger and out the vent to the chimney or sidewall vent. This ensures gases are expelled safely and prevents them from entering the living space, while also helping the furnace vent properly during operation. It may run during the burn cycle and often purges the system after shutdown to clear residual gases. It isn’t responsible for pushing heated air into rooms, filtering combustion air, or igniting the fuel.

The induced draft blower is part of the furnace’s exhaust path. Its job is to create a controlled draft that pulls the combustion products through the heat exchanger and out the vent to the chimney or sidewall vent. This ensures gases are expelled safely and prevents them from entering the living space, while also helping the furnace vent properly during operation. It may run during the burn cycle and often purges the system after shutdown to clear residual gases. It isn’t responsible for pushing heated air into rooms, filtering combustion air, or igniting the fuel.