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Air Ducts - Friction Loss Diagram

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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 (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 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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Related Topics

Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

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Air Duct Velocities

Typical air duct velocities in applications like ventilation systems or compressed air systems.

Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm.

Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - in imperial units ranging 10 000 - 400 000 cfm.

Air Ducts - Major Friction Head Loss, Online Calculator

Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units.

Air Ducts - Major Friction Loss vs. Temperature and Pressure

The influence of temperature and air pressure on major friction loss.

Air Ducts - Minor Loss Coefficient Diagrams

Minor loss coefficient diagrams for air ductwork, bends, expansions, inlets and outletsĀ  - SI units.

Air Ducts - Sizing

Required duct area vs. air flow.

Circular Ducts - Dimensions

Standard size of circular ventilation air ducts.

Duct Sizing - the Equal Friction Method

The equal friction method for sizing air ducts is easy and straightforward to use.

Duct Velocity

Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.

Energy Equation - Pressure Loss vs. Head Loss

Calculate pressure loss - or head loss - in ducts, pipes or tubes.

Equivalent Diameter - Rectangular vs. Circular HVAC Ducts

Rectangular equivalent diameter for air flows between 100 - 50000 cfm.

Equivalent Length vs. Minor Pressure Head Loss in Pipe and Duct Components

Minor pressure and head loss in pipes vs. equivalent length in tubes and duct systems.

Rectangular Air Ducts - Velocity Diagram

Velocity diagram for rectangular air ducts - metric units.

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