Noise levels and required attenuation are printed for each runout duct. Duct sizes can be calculated on a round, rectangular, and flat oval basis. Ductsize quickly calculates optimal duct sizes using either the static regain, equal friction, or constant velocity method. If you are an engineer or HVAC designer who wants to step up to the ultimate in a duct sizing program, then Ductsize is for you. You can let the program size all the ducts for you or enter your own sizes to analyze an existing design. HVAC Duct Sizing and Analysis Software - *Ductsize Static Regain & Equal Friction* Ductsize from Elite Software lets you create a complete duct system from start to finish, and gives you control over every aspect of the design.