Formula To Convert Rectangular Duct To Round Duct

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.

Formula to convert rectangular duct to round duct.

Convert round duct size to rectangular duct size for equivelant airflow. If it cannot be converted to round because of restrictions it should be converted to an equivalent flat oval size. The calculator below is based on formula 1. 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.

This can be found by multiplying the two adjacent sides of the rectangular duct. Step 5 select a size of square duct that has the same area. Approaches the efficiency of round 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.

2001 ashrae fundamentals p. 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. The formula is generic and any unit can be used.

D e 1 30 300 mm 500 mm 0 625 300 mm 500 mm 0 25 420 mm. Other hart cooley mobile tools. Https amzn to 39pgvjc 1 wireless refrigeration. Friction loss calculator for sheet metal ducts.

Friction loss calculator for flexible ducts. That will at least give the duct. An aspect ratio of 1 is round duct. This is a handy tool when deciding what size duct you want to use for your application.