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Formula to convert rectangular duct to round duct. The equivalent diameter of a 300 mm x 500 mm rectangular duct can be calculated as. Friction loss calculator for sheet metal ducts. The calculator below is based on formula 1. Step 5 select a size of square duct that has the same area.
Https amzn to 39pgvjc 1 wireless refrigeration. 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. Rectangular to equivalent circular duct calculator. How to calculate duct sheet area duct quantity rectangle duct square duct round duct flat oval duct amazon.
If it cannot be converted to round because of restrictions it should be converted to an equivalent flat oval size. An aspect ratio of 1 is round duct. 2001 ashrae fundamentals p. Approaches the efficiency of round duct.
D e 1 30 300 mm 500 mm 0 625 300 mm 500 mm 0 25 420 mm. Convert round duct size to rectangular duct size for equivelant airflow. When a designer sees rectangular duct on a drawing they should convert it to an equivalent round size if possible. Rectangular to round conversion de 1 30 ab 0 625 a b 0 250 a length of one side of rectangular duct inch b length of adjacent side of rectangular duct inch de circular equivalent of rectangular duct for equal friction and capacity inch source.
That will at least give the duct. The formula is generic and any unit can be used. This can be found by multiplying the two adjacent sides of the rectangular duct. For rectangular ducts a width of duct side inches b height of other duct side inches equivalent round duct size for a rectangular duct equivalent round duct size for a rectangular duct can be expressed as deq 1 3 x a x b 0 625 a b 0 25 where deq equivalent diameter a one dimension of rectangular duct inches.
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