This is a limitation of the version of ASHRAE tables that Revit uses. And the other posts haven't really helped that. Tees still don't look up ASHRAE tables by default. tbl is simply linked based on the name of the Table, in this case, it would use the data from the SR3-1.tbl file. So, this is how a fitting is linked to a table in the. SR3-1 Elbow, 90 Degree, Variable Inlet/Outlet Areas, Supply Air Systems (Idelchik 1986, Diagram 6-4) If you modify the fitting to invalidate any of these formulae, the ASHRAE table entry for SR3-1 no longer is available… i.e., adjust the fitting so it is no longer 90. I.e., there are checks for the angle (theta), width ratios and height/width ratio. If you look at the XML for this entry, you see the following, with several Formulae used to validate if this ‘Table’ applies to the fitting. The first one that defaults for me is SR3-1, probably due to the order in the XML file (but I didn’t verify). Now, the ASHRAE Table list is populated with a list of entries. Now, using additional ductwork as necessary, connect the fitting to a supply air terminal. For this particular fitting, the may not matter at all, but in the general case for reducing/enlarging fittings, etc, this is at least somewhat necessary. There is also ‘Common’, but the Revit doesn’t let you select a ‘Common’ one since you can’t select a ‘direction’ specific one since the direction is not yet known. Insert the fitting… there are no ASHRAE tables listed in properties because the tables are generally specific to ‘Supply’ or ‘Return’. Let me explain by an example of how this works, using the ‘Rectangular Elbow – Radius’ fitting.
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