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Ducts are commonly classified as
Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm.
Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units.
Standard size of circular ventilation air ducts.
Ventilation systems can be classified by functions, distribution strategies or by ventilation principles.
Duct systems are commonly divided into three pressure classifications.
Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.
The velocity reduction method can be used when sizing air ducts.
Calculate pressure loss - or head loss - in ducts, pipes or tubes.
Rectangular equivalent diameter for air flows between 100 - 50000 cfm.
The inches fractional and decimal equivalents.
Recommended air velocities in HVAC ducts.
Estimate noise generated by air flow in ducts.
Surface coefficients that can be used to calculate friction and major pressure loss for fluid flow with surfaces like concrete, galvanized steel, corroded steel and more.
Size and capacities of air return intakes.
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