Air Ducts Friction Loss Diagram

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Friction loss in standard air ducts are indicated in the diagram below.

• 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

The friction loss in a 500 mm main duct in comfort system with air flow 1 m³/s can be estimated as indicated below to 0.05 mm H₂O/m (~ 0.5 Pa/m).

The air velocity in the duct is 5 m/s.

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• Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

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