Currently, the duct "size" parameter does not reliably sort in the expected order.
For example, in the following screenshot, one would expect to read the size in the direction of the airflow (going up the page) but instead it's reversed:


Better automatic sorting would be the ideal solution. However, having a manual override that allows us to change the sort order in a list (by duct fitting instance) would be useful when more complicated duct fitting occur, like wyes or other multi-port fittings:
