Customize sections, airflows, duct sizes and minor dynamic loss coefficients - add pressure loss paths and evaluate and reconfigure the system to fit your criteria. This template is based on the in the spreadsheet. The velocity method can be done manual or more or less semi automatic with the spreadsheet template below. Sizes of ducts are then given by the continuity equation like:Įstimate friction loss in main and branch ducts from the charts below:Īir Ducts Sizing Spreadsheet Template Air Ducts Spreadsheet Template - The Velocity Method dust collection systems with heavy particulate like metals: 5000 fpm (25 m/s).dust collection systems with small particulate: 3500 fpm (18 m/s).transport of fumes, mist or very light particulates: 2400 fpm (12 m/s).upstream medium pressure VAV boxes: 2000 to 2500 fpm (10 - 13 m/s).Velocities commonly used for different applications: Be aware that high velocity close to outlets and inlets may generate unacceptable noise.
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