HVAC - Ductwork sizing, calculation and design for efficiency

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link is below for Ductulator
Air Duct Calculators (Ductulator) how to duct sizing in Hindi / English

How to design a duct system. In this video we'll be learning how to size and design a ductwork for efficiency. Includes a full worked example as well as using CFD simulations to optimise the performance and efficiency.

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If you use CFM (English) then your duct size should be inches It is better to use duct calculator .McQuay Duct Sizer is much better either by friction method or velocity method .The instruction is worst instruction video I watched in Youtube