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The cut off plate is a component of the:

  1. blower housing

  2. burner assembly

  3. heat exchanger

  4. thermostat

The correct answer is: blower housing

The cut off plate is a component of the blower housing. It is designed to control the airflow within the heating system by blocking or directing the flow of air as needed. The blower housing functions as a protective cover for the blower wheel and motor, ensuring efficient and safe operation of the blower assembly. Therefore, the correct answer is A. Option B, the burner assembly, consists of components responsible for the combustion process, such as the burners, pilot assembly, and gas valve. Option C, the heat exchanger, is responsible for transferring heat from the combustion process to the air that is circulated throughout the system. Option D, the thermostat, is a device that monitors the temperature within the living space and signals the heating system to turn on or off accordingly.