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Air Ducts - Friction Loss Diagram

Major loss diagram for air ducts - SI units

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Friction loss in standard air ducts:

air ducts major loss diagram

  • 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 (lbf/in2)

Example - Air Duct and Friction Loss

As indicated in the diagram below, 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 0.05 mm H2O/m (~ 0.5 Pa/m).

air ducts major loss diagram example


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