Ranking - Utilities (iPhone)
HVAC Duct Size Calculator by Alan Cave
The app goes beyond simply calculating velocity, friction, or volume; It also offers a list of ducts that meet the design criteria for the user's review and consideration.
The app features a highly intuitive interface which allows the user to easily adjust values with precision (without the use of cumbersome "slider" controls), or alternatively to enter the values directly with a keypad interface.
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