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Altitude(ft)
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Temperature(F)
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Humidity(%)
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Enter inputs on the left, click
the "Calculate" button for results.
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Density
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Kinematic Viscosity
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0.076354 lb/ft³
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1.5972E-4 ft²/s
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ACCA Standard Air: 0(ft), 60°(F), 0(%)
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To find diameter and velocity; select the duct type and enter the rate of friction loss (pressure drop per 100 feet) and the cfm.
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Duct Type
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Friction Rate
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CFM
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Roughness 0.01ft
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"wc/100ft
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ft3/m
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To find diameter and friction loss; select the duct type, enter length, cfm and velocity. Omit length to find diameter only.
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Duct Type
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Length
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CFM
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Velocity
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Roughness 0.01ft
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ft.
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ft3/m
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ft/m
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To find cfm and friction loss; select the duct type, enter length, diameter and velocity. Omit length to find cfm only.
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Duct Type
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Length
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Diameter
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Velocity
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Roughness 0.0003ft
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ft.
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in.
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ft/m
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To find velocity and friction loss; select the duct type, enter length, diameter and cfm. Omit length to find velocity only.
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Duct Type
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Length
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Diameter
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CFM
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Roughness 0.01ft
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ft.
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in.
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ft3/m
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To find rectangular to round equivalent; enter side (a) and side (b). Enter equivalent diameter and side (a) to calculate side (b).
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Side (a)
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Side (b)
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in.
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in.
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Equivalent Diameter
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Side (a)
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in.
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in.
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To find flat oval to round equivalent; Enter major and minor axes. For ovaled round duct, enter diameter before ovaling and its minor axis.
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Major Axis
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Minor Axis
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in.
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in.
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Diameter Before Ellipse |
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Minor Axis
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in.
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in.
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