Wye / Bullnose Tee
To insert a wye or bullnose tee fitting, go to
Ribbon: 
Wye/Bullnose Tee
Pulldown Menu:
You will be prompted to specify the duct on which a wye or bullnose tee 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 wye. Turning vanes will only be shown if the ductwork is rectangular.
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 Turning vanes will not be inserted in the wye.
A wye or bullnose tee fitting will be inserted on the drawing, as shown below. The specific fitting that is inserted depends upon the configuration of the duct centerlines. If the centerlines form right-angles, a bullnose tee will be inserted. Otherwise, a wye will be inserted.
Turning vanes on square elbows and wyes: Sets whether turning vanes are inserted on wyes when sizing ducts.