This program allows you to draw the HVAC duct works dynamically and professionally, regardless of the current drawing's units. Furthermore, lots of fittings are included within this program, such as Duct <Straight>, 3Points Duct with Elbows, either 45 or 90 Degs, Elbows [30,45,60,90], Taper, Tee, Reducer, Offset and Undo, allowing the user to undo the last drawn objects which mean to undo the last process.
Also, the program uses specific layers for specific systems like Air-conditioning, Fresh Air and Exhaust air systems with respect to Color, LineType and LineWeight. This allows them to be by layer regardless of the settings of the current layer.
The program allows the user to change the units of the text of Duct size and allows the user to add a label for the airflow rate.
The second update is about new useful features that were asked by many users of my applications to have a square elbows with the same elbow types that are available for the round elbows along with a new option to add fins insides elbows up to 5 Nos of fins and having a new technique that detects the center points of the last drawn fitting automatically.
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Finally, the Program should work approximately 450 times. The time starts at the first moment you run the program on your system. If you have used the program for one month and it expires then this means you have used all the benefits of the program. If you have used the program only a few times and left it for more than one month from the moment you first ran the program then it will expire since it did exceed 30 days.