The airflow required for each unit of cooling capacity is a critical factor in HVAC system design. Typically, this is measured in cubic feet per minute (cfm) of air per ton of cooling. For example, a system requiring 400 cfm of airflow to deliver one ton of cooling would be expressed as 400 cfm/ton.
Correct airflow is essential for efficient and effective cooling. Insufficient airflow can lead to reduced cooling capacity, increased energy consumption, and potential equipment damage due to overheating. Conversely, excessive airflow can result in wasted energy and uncomfortable drafts. Historically, standard practice dictated airflow rates around 400 cfm/ton. However, advancements in HVAC technology and a greater emphasis on energy efficiency have led to systems operating with varying airflow requirements, often lower than this traditional benchmark.