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Thank you imok, The additional method, u mentioned about Total pressure was very new to me. Thanks once again for a god description.

Thanks CinciMace for your reply. Which means all these three methods are entirely different and are based on applications. But i guess the ductulator has no provision for the Static regain method. Can you suggest the application and methods used for Static regain. Do u suggest a software that i...

Thank you for your replies but i still am not sure if the method used in sizing ducts using Equal velocity is exactly the same as in Equal friction. When using the equal friction method, does the velocity remain more or less the same across the entire length of the duct (atleast the main branch)

I know of these 3 methods that are used in the industry. 1.Equal friction method 2. Static regain method 3. T method But have also heard many saying "Constant velocity" method. Is this another name for the Equal friction method.