Measuring the 20 Percent Rule Through Airflow and Static Pressure Data Points
The 20 percent rule in HVAC refers to a critical airflow benchmark: your system must deliver approximately 400 CFM (cubic feet per minute) of conditioned air per ton of cooling capacity, meaning a 5-ton unit should move 2,000 CFM. We evaluate this standard by measuring static pressure data across your https://claude.ai/public/artifacts/0bbb8f92-4faf-4105-bbd3-8d327662b260 ducts and blower output to verify your system meets these documented ranges, making sure ideal coolin