What is the minimum airflow requirement for a ton of air conditioning in CFM?

• A. 200 CFM
• B. 360 CFM
• C. 400 CFM
• D. 440 CFM

Answer: (C)

The minimum airflow requirement for a ton of air conditioning is typically set at 400 cubic feet per minute (CFM). This standard is based on the need to effectively maintain indoor comfort and proper humidity control while operating an air conditioning system. The 400 CFM per ton benchmark allows for adequate cooling capacity and efficient operation, ensuring that the system can effectively remove heat from the indoor environment.

In practice, this measurement means that for every ton of cooling capacity, the air conditioning system should move about 400 CFM of air through the evaporator coil to achieve optimal performance. This not only helps in cooling the space effectively but also assists in managing the humidity levels, which is crucial for maintaining comfort.

Variations in the minimum CFM requirement can occur based on specific system designs, the type of space being conditioned, and local building codes. However, 400 CFM remains a widely accepted standard in the HVAC industry, particularly for conventional systems. Understanding this standard is essential for HVAC professionals when designing, installing, and maintaining air conditioning systems.