【實用商業app】Duct Conversion Calculator|最夯免費app-綠色工廠好玩App

Hello World! A must have app for all hvac general contractors. This app will calculate transition between rectangular duct sizes into its equivalent circular diameter.The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe.Please support my app by downloading it today. I will add more functionality soon!