How should airflow be adjusted on a heater with a belt-driven blower?

Adjusting airflow on a heater with a belt-driven blower primarily involves modifying the motor pulley. This method allows for greater control over the blower speed by changing the diameter or size of the motor pulley compared to the driven pulley. By adjusting the size of the motor pulley, you can either increase or decrease the speed of the blower, which directly affects the volume of air being moved through the system.

This approach is advantageous because it can fine-tune the airflow to match the specific heating requirements of a space without the need for extensive modifications to the system or replacing components. Conversely, changing the blower motor may not necessarily help with airflow adjustment alone, and reshaping the ductwork can introduce other complications without a direct means of controlling blower speed. Lowering the temperature setting does not influence airflow volume; instead, it just reduces the system's heating demand. Therefore, altering the motor pulley remains the most effective method for managing airflow in a belt-driven blower system.