Square To Round Duct Calculator
Square To Round Duct Calculator . 1 d e = 1.30 ( a b ) 0.625 / ( a + b ) 0.250. Convert rectangular or square duct to round sizes calculator eq. Ducting Calculator from www.sliderule.ndo.co.uk The equivalent diameter of a oval duct or tube (ellipse) can be calculated as (heyt & diaz) d e = 1.55 a 0.625 / p 0.25 (2) where 1 d e = 1.30 ( a b ) 0.625 / ( a + b ) 0.250. Convert round duct size to rectangular duct size for equivelant airflow.