What is the function of a cut-off plate in a gas furnace?

A cut-off plate in a gas furnace primarily serves to direct the airflow and provide a barrier, which is essential for maintaining efficient operation. This component is often included as part of the blower housing assembly. Its presence helps in preventing unintentional mixing of exhaust gases with the fresh air entering the furnace, which is crucial for safety and efficiency.

By ensuring that air is channeled correctly, the cut-off plate contributes to the overall performance of the system, as it aids in creating an appropriate pressure balance, thus enhancing the blower's efficiency. This function is essential in maintaining the furnace's operational integrity and preventing issues related to combustion and airflow.