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Air Ducts - Friction Loss Diagram

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

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Friction loss (head loss) in standard air ducts:

air ductwork friction loss diagram

The diagram is based on standard air 0.075 lb/ft³ in clean round galvanized metal ducts.

1 inch water = 248.8 N/m²(Pa)= 0.0361 lb/in² (psi) = 25.4 kg/m² = 0.0739 in mercury
1 ft³/min (cfm) = 1.7 m³/h = 0.47 l/s
1 ft/min = 5.08x10^-3 m/s
1 inch = 25.4 mm = 2.54 cm = 0.0254 m = 0.08333 ft

Example - Friction Loss in Air Duct

The friction loss in a 20 inches duct with air flow 4000 cfm can be estimated to approximately 0.23 inches water per 100 feet duct as shown in the diagram below. The air velocity can be estimated to approximately 1850 feet per minute.

ductworks friction loss diagram example

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Related Topics

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

Related Documents

Air Ducts - Friction Loss Diagram - Major loss diagram for air ducts - SI units
Air Ducts - Friction Loss Diagram - Major loss diagram for air ducts - in imperial units ranging 10 000 - 400 000 cfm
Air Ducts - Sizing - Air flow and required duct area
Air Ducts Sizing - The ductwork of ventilation systems are often sized with either the Velocity, the Constant Pressure Loss (or Equal Friction Loss) - or the Static Pressure Recovery Methods
Duct Velocity - Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator
Equal Friction Method - The equal friction method for sizing air ducts is easy and straightforward to use
Equivalent Diameter - Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator with imperial and SI-units
Equivalent Diameter - Rectangular and Circular HVAC Ducts - Equivalent diameter for rectangular and circular ducts - air flows between 100 - 50000 cfm
Friction Loss in Air Ducts - Friction loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - imperial and SI units
Hydraulic Diameter - Hydraulic diameter of pipes and ducts
Major loss in Ducts, Tubes and Pipes - Major loss - head loss or pressure loss - due to friction in ducts, pipes and tubes
Sizing Circular Ducts - A rough guide to maximum air volume capacity of circular ducts in comfort, industrial and high speed ventilation systems
Typical Air Velocities in Ducts and Pipes - Typical air velocities in applications like ventilation systems or compressed air systems

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