That will at least give the duct.
Formula to convert rectangular duct to round duct.
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An aspect ratio of 1 is round duct.
Convert round duct size to rectangular duct size for equivelant airflow.
The calculator below is based on formula 1.
Rectangular to equivalent circular duct calculator.
This is a handy tool when deciding what size duct you want to use for your application.
How to calculate duct sheet area duct quantity rectangle duct square duct round duct flat oval duct amazon.
Friction loss calculator for sheet metal ducts.
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If it cannot be converted to round because of restrictions it should be converted to an equivalent flat oval size.
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Step 5 select a size of square duct that has the same area.
Friction loss calculator for flexible ducts.
The equivalent diameter of a 300 mm x 500 mm rectangular duct can be calculated as.
Approaches the efficiency of round duct.
D e 1 30 300 mm 500 mm 0 625 300 mm 500 mm 0 25 420 mm.
The formula is generic and any unit can be used.
Multiply this number by 3 14 pi to get the area of the round duct in square inches for example 16 x 3 14 50 24 square inches.
Equivalent duct calculator round vs rectangular.
When a designer sees rectangular duct on a drawing they should convert it to an equivalent round size if possible.