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# Air Ducts - Sizing

## Required duct area vs. air flow.

Air flow, air velocity and required air-duct area:

• 1 ft/min = 5.08x10-3 m/s
• 1 ft3/min = 1.7 m3/h = 0.47 l/s
• 1 ft2 = 0.0929 m2 = 144 in2

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## Related Topics

• ### HVAC Systems

Design and sizing of Heating, Ventilation and Air Conditioning systems.
• ### Ventilation Systems

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

## Related Documents

• ### Air Duct Components - Minor Dynamic Loss Coefficients

Minor loss (pressure or head loss) coefficients for air duct components.
• ### 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 - SI units.
• ### Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm.
• ### Air Ducts - Velocity Diagram

Air flow volume, duct size, velocity and dynamic pressure.
• ### Circular Ducts - Dimensions

Standard size of circular ventilation air ducts.
• ### Duct Velocity

Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.
• ### Ducts or Pipes through Steel Joists - Maximum Sizes

Maximum sizes of ducts or pipes through K series joists.
• ### Ducts Sizing - the Velocity Reduction Method

The velocity reduction method can be used when sizing air ducts.

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## Citation

• The Engineering ToolBox (2010). Air Ducts - Sizing. [online] Available at: https://www.engineeringtoolbox.com/air-ducts-sizing-d_1736.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

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