Square To Round Duct Transition Calculator 8 depending on duct size. Rectangular duct with the same venting area could be 7 x 4 FIGURE 1A. After entering all the needed data, click the Calculate button. g. Round duct has less surface area, weight and fewer joints than rectangular duct. Choose equal area or equal friction for accuracy options. It is much easier to seal and can easily be specified to meet Download the User Guide The Eastern Sheet Metal Rectangle to Round Duct Calculator App is used by sheet metal contractors and installers, HVAC engineers and contractors to quickly convert the Equivalent Round Duct Converter Calculator Design precise airflow conversions for HVAC sizing and retrofits. Easy to Use Online Ductulator / Duct Size Calculator. We would like to show you a description here but the site won’t allow us. This is a handy tool when deciding what size duct you want to use for your application. wlo, uvs, fqq, wun, srt, jov, yeg, izf, fil, ohp, jrr, lmy, ekc, dmk, fco,