How to Size HVAC Ducts: CFM, Velocity, and Friction Rate
Size HVAC ducts using room airflow, air velocity, available static pressure, total effective length, and a proper friction-rate calculation.
Trade & Engineering guides
HVAC, electrical, piping, and mechanical calculators for tradespeople. These guides explain the assumptions, choices, and real-world factors behind the numbers.
Browse Trade & Engineering calculators