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

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

• A. 250-350cfm
• B. 350-450cfm
• C. 450-550cfm
• D. 150-250cfm

Answer: (B)

Airflow across the evaporator coil is chosen in cubic feet per minute per ton to balance heat transfer and humidity removal. For residential systems, about 350 to 450 cfm per ton is the generally accepted range. This wide interval accommodates different coil designs, duct runs, and blower types while ensuring the coil has enough air to transfer heat efficiently and remove moisture effectively. If the airflow is too low, the coil can’t shed heat well, reducing cooling capacity and humidity control. If it’s too high, the air moves too quickly to pick up much heat or moisture, wasting fan energy and potentially making the space feel less comfortable. A common target around 400 cfm per ton works well for many setups.

Airflow across the evaporator coil is chosen in cubic feet per minute per ton to balance heat transfer and humidity removal. For residential systems, about 350 to 450 cfm per ton is the generally accepted range. This wide interval accommodates different coil designs, duct runs, and blower types while ensuring the coil has enough air to transfer heat efficiently and remove moisture effectively. If the airflow is too low, the coil can’t shed heat well, reducing cooling capacity and humidity control. If it’s too high, the air moves too quickly to pick up much heat or moisture, wasting fan energy and potentially making the space feel less comfortable. A common target around 400 cfm per ton works well for many setups.