Duct sizing can get very technical when taking friction losses flow rates velocities surface tension material composition and hydraulic diameters into consideration.
Rectangular to circular duct.
Spiral ducts are normally produced in longer lengths than rectangular ducts.
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Round ducts have virtually no wall deflection in normal operating conditions and the helical spiral seams strengthen the duct even more.
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The table is based on the ducts friction loss formula.
The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe.
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Each box of metal duct contains five 5 ft.
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As a rule of thumb size rectangular ducts slightly larger than circular ducts in terms of cross sectional areas due to increased surface areas in rectangular ducts.
Engineered with a leed qualifying zero voc gasket this ductwork can eliminate the need for additional sealing along the longitudinal seams and transverse joint.
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The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
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The equivalent diameter is the diameter of a circular duct or pipe that for equal flow gives the same pressure loss or resistance as an equivalent rectangular duct or pipe.
Learn the differences between round and rectangular air ducts from our commercial hvac pros.
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The rectangular dimensions and the air flow volume are adapted to the equal friction loss.