Square Elbow
To insert a square elbow fitting, go to
Ribbon: 
Square Elbow
Pulldown Menu:
You will be prompted to specify the duct on which a square elbow is to be inserted.
Select duct or label to insert fitting at:
The Turning Vanes? dialog box will appear.
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 Turning vanes will be inserted in the square elbow. Turning vanes will only be shown if the ductwork is rectangular.
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 Turning vanes will not be inserted in the square elbow.
A square elbow will be inserted on the drawing, as shown below.
Related Options
Turning vanes on square elbows and wyes: Sets whether turning vanes are inserted on square elbows when sizing ducts.