Commercial Kitchen Exhaust System Components Practice Test

What is a potential consequence of undersized ductwork for a given exhaust CFM?

Increased static pressure, reduced airflow, higher energy use, and potential performance issues. Decreased static pressure and increased airflow. No impact on system performance. Reduced energy consumption.

Correct Answer:

Increased static pressure, reduced airflow, higher energy use, and potential performance issues.

Explanation:

When ductwork is undersized for a given exhaust rate, air faces more resistance as it must pass through a smaller cross-section and through fittings and bends. That extra resistance shows up as a higher static pressure that the fan has to overcome to move air. If the fan can’t increase its pressure enough to push the same amount of air, the actual airflow drops. The system then consumes more power as the motor works harder to overcome the added friction, which means higher energy use. This scenario also tends to bring about performance problems like louder operation, poorer capture of grease and smoke, and potential reliability issues. So the key consequence is higher static pressure, reduced airflow, increased energy consumption, and possible performance problems.

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