Air Duct Pressure Loss Calculation

Air ducts are enclosed carriers used in ventilation and air-conditioning (HVAC) systems to distribute fresh air into spaces and remove exhaust air. Depending on criteria such as duct cross-section, material, airflow rate, air velocity, and installation conditions, ducts can be selected as round, rectangular, oval, or flexible types.

Properly sized air ducts are critical to achieving low pressure loss, quiet operation, energy efficiency, and indoor comfort. This page provides information on typical application areas and advantages of different duct types, as well as the key engineering parameters to consider during duct design.