Technician Tool
Airflow, CFM & static pressure
Calculate duct airflow from measured velocity, convert tonnage and a chosen CFM-per-ton target into total airflow, and calculate total external static pressure for field diagnosis.
Airflow from duct velocity
Duct CFM calculator
Enter the duct size and an average measured air velocity. The tool converts the duct area to square feet and calculates CFM.
Enter the duct dimensions and average velocity to calculate CFM.
A single velocity reading can misrepresent actual duct airflow. Use an appropriate traverse or measurement method for the duct and instrument whenever accuracy matters.
Airflow target helper
Tonnage × CFM per ton
Enter the equipment tonnage and the airflow target you want to use. Use the manufacturer setup data or design requirement for the actual target. Do not assume one CFM-per-ton value fits every application.
Enter tonnage and the chosen CFM-per-ton target.
Airside resistance
Total external static pressure
Enter supply static as a positive value and enter the return static as its positive magnitude. The tool adds both magnitudes to calculate total external static pressure.
Enter supply and return static pressure to calculate TESP.