Electrical Transformer: This lowers the incoming voltage (240 volts) to a voltage usable by the furnace’s control elements (often 24 volts) Blower or Blower Fan: Internal motorized fan that ...

Furnace igniters work by creating a spark to cause ignition, or by producing an extremely hot surface that ignites the gas as it passes. Blower fan: A small electric fan and motor that directs ...