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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.

I'm no Apple genius. Everyday is a learning experience for me. Support my app development and download it today. I will add more features and functionality to this app. Download it now!