When selecting a replacement motor for a furnace, what type of bearings should be used for a low noise level?

Selecting the appropriate type of bearings for a replacement motor in a furnace is crucial for minimizing noise levels. Sleeve bearings are the ideal choice in this scenario because they provide a smooth operation and produce less noise compared to other bearing types.

Sleeve bearings, which consist of a simple cylindrical sleeve that the motor shaft rotates within, tend to have lower friction and less moving parts, which significantly reduces operational noise. This makes them well-suited for applications where quiet operation is preferred, such as in residential heating systems where noise can be disruptive.

On the other hand, while ball bearings and roller bearings are known for their durability and ability to handle heavier loads, they typically generate more noise due to their construction and the rolling action involved. Magnetic bearings offer superb performance characteristics and minimal friction but are typically used in specialized applications rather than standard residential furnaces, adding complexity and cost beyond what is necessary for effective operation in this context.

Therefore, sleeve bearings stand out as the optimal choice for ensuring low noise levels in furnace motors.