The Tools program just sizes one duct at a time in order to minimize the data entry required. The same situation exists with psychrometrics, pipe sizing, and wire sizing. Elite has other programs you may want to consider that address those applications on a complete system basis. HVAC Tools is a simple and easy to use Windows programs designed for both engineers and contractors. A lower priced DOS version of Tools is also still available.
All input data is checked at the time of entry so that no improper data can be entered.
Each function of Tools requires only one screen of input data. Most functions require only a few items of input data. Others, like the HVAC Formula look-up, require almost no input data. The Duct Size function, for example, requires the length of the duct, the cfm of air carried by the duct, the desired pressure loss per 100 feet of duct, and the material of the duct. There is also provision for entering height and width constraints along with minimum and maximum velocity constraints.