Air Conditioning Repair Certification (ETI) Practice Exam

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What is the generally accepted range for evaporator airflow in CFMs per ton of residential air conditioning?

100 to 200 CFM

350 to 450 CFM

The generally accepted range for evaporator airflow in residential air conditioning systems is indeed between 350 to 450 cubic feet per minute (CFM) per ton. This range is based on balancing the system's efficiency, comfort, and moisture removal capabilities.

When airflow falls within this range, the system can effectively remove heat from the indoor air while maintaining proper humidity levels. This airflow is crucial because it ensures that the evaporator coil operates efficiently, allowing for optimal heat exchange and preventing issues such as coil freeze-up or insufficient cooling.

Airflow that is too low can lead to poor cooling performance and increased humidity, while airflow that is too high might not allow enough time for the refrigerant to absorb heat effectively. Therefore, maintaining airflow in this specified range helps to optimize the performance of a residential air conditioning system.

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500 to 600 CFM

200 to 300 CFM

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