1. In Loss Method of duct fittings Properties, for the options "Specific coefficient" and "Specific Loss", it works for elbow, transition fittings(two connector fittings), and currently its limitation for Tee/Tap or Cross. so we have to use ASHRAE Table for these fittings.
Please add the option to specify the Loss Method as User Defined and apply the value to the Pressure Drop parameter, like when specific a coefficient, input both Main and Branch coefficient in Properties.
2. Currently when working with ASHRAE Table for different sizes, often shows”No ASHRAE table is applicable to the selected object" or incorrect table in Loss Method Settings dialog box.
For example, reading the table ER5-3 from ASHRAE standard, the table is only valid when Ab/Ac=0.5. But in engineering design working with ASHRAE Table，when Ab/Ac ≠0.5, we also refer to the value in table ER5-3. Ab/Ac=0.5 is a test environment in ASHRAE, should not be the necessary condition.
So please remove unnecessary conditions when looking for ASHRAE tables in Revit.
