For large sprawling duct systems it is difficult to monitor all the duct sizes that change. When you calculate and redraw a single branch, all the ducts are erased and redrawn. This makes it difficult to know which duct sizes changed and which stayed the same.

Be able to right click or slow-double-click on a room name in the Zone Tree or Floor Tree to be able to change it

It would be nice to at least have the command to match diffuser callout location.

Add leader for duct text like it does when you add a grille, diffuser, or light fixture

When printing load calculations, have a Select All/Unselect All check box. It's a bit tedious to do manually.

If the minimum air flow is set in the calculation bases on a parameter such as air change rate, cfm/sq ft or a set cfm it would be nice to have that as a column in the calculation output.

Add a label and leader for the callout to mechanical equipment.

Add an option for the default "max depth" value that is used when you insert a new duct. Currently it always starts at 24 and you have to remember to change it if you want something different.

This is similar to the 'end cap' command, but would draw a 'capped for future use' symbol on the end of a duct branch.

Be able to specify a pressure drop in the ductwork that changes based upon the airflow in the ductwork.

We currently allow you to lock a specific pressure drop but it does not change as the design changes. Instead lock an equivalent duct length or something similar that would change based upon the airflow.

In the diffuser definition dialog box, designate whether it is a 1W, 2W, 3W or 4W diffuser, then attach that number of arrows. When placing the diffuser, allow the user to rotate the diffuser to align the appropriate air flow direction.