Air Ducts - Friction Loss Diagram

Friction loss in standard air ducts:

Download and print Air Duct Pressure Loss vs. Air Flow and Duct Dimension Chart

• 1 m/s = 196.85 ft/min
• 1 m³/s = 3600 m3/h = 1000 dm³(liter)/s = 35.32 ft³/s = 2118.9 ft³/min = 13200 Imp.gal (UK)/min = 15852 gal (US)/min
• 1 mm H₂O = 9.81 Pa = 9.807x10^-6 N/mm² = 0.0987 10^-3 bar = 1 kp/m² = 0.09678 10^-3 atm = 1.422 10^-3 psi (lb_f/in²)

Example - Air Duct and Friction Loss

As indicated in the diagram above, the friction loss in a 500 mm main duct with air flow 1 m³/s  - in a comfort system with air velocity limited to 5 m/s - can be estimated to 0.55 Pa/m (0.055 mm H₂O/m).

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