Air Ducts Friction Loss Diagram

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Major loss diagram air ducts - SI units

The friction loss in standard air ducts can be estimated with the diagram below.

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 Pa = 1 N/m² = 1.4504x10^-4 lb/in² = 1x10^-5 bar = 4.03x10^-3 in water = 0.336x10^-3 ft water = 0.1024 mm water = 0.295x10^-3 in mercury = 7.55x10^-3 mm mercury = 0.1024 kg/m² = 0.993x10^-5 atm

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 shown below to 0.5 Pa/m.

air ducts major loss diagram example

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

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