What is the maximum allowable RPM differential for two force draft blowers operating in parallel?

The maximum allowable RPM differential for two force draft blowers operating in parallel is specified to ensure optimal performance and to prevent operational issues such as vibrations or imbalances. A differential of 300 RPM allows the blowers to operate efficiently without risking mechanical failure or affecting the system's overall stability.

In a parallel operation, it is crucial that the blowers work within a specified RPM range to maintain proper airflow and pressure. A differential larger than this can lead to one blower working harder than the other, which can affect the longevity of the equipment and potentially lead to serious issues, such as failure or excessive wear.

This operating limit is designed to maximize efficiency while maintaining system integrity, making 300 RPM the correct choice for the maximum allowable differential in this context.