To display the Defaults tab, select a duct in your drawing, right-click, and select Properties. The Duct Properties dialog box displays. Click the Defaults tab to view the available properties.
Transition Angle
Specifies the default transition angle used to calculate transition length. Type a value in the current angle measurement. The software uses this value to calculate transition length by using the following formula:
L = (W1 - W2) / tan x (where x is equal to this transition wall angle that you define)
Editing the transition angle does not affect any transitions that you placed previously. To modify the transition angle for existing transitions, use the Edit Properties page for the transition objects. The default transition length is 15 degrees.
Bend Radius Multiplier
Defines the turn radius that the software will use for turns while routing as a multiplier function of the duct dimension in the plane of the turn. The dimension used is the diameter for round cross section, the width dimension, or the depth dimension, depending upon the plane of the turn. If you change the bend radius multiplier, the software automatically changes the throat radius value.
The list displays the last five values in numeric order. If this is the first time in the session file, the Bend Radius Multiplier is the default from the active specification.
Throat Radius
Defines the throat radius dimension for the turn feature. If you change the throat radius, the software automatically updates the bend radius multiplier. The list displays the last ten radii used.
Minimum Straight Length
Defines the shortest allowed length of a straight feature that extends outside a coupling.
Turn Part
Defines the type of turn part and its radius.
Branch Part
Defines the type of branch part that you use when you are routing duct.
Depth/Width Ratio (Rect)
Displays the depth and width ratio for rectangular ducts.
Depth/Width Ratio (Flat Oval)
Displays the depth and width ratio for flat oval ducts.
Radius
Specifies the radius of the turn.
Number of Miters (0-30)
Specifies the number of miters for a turn of 0-30 degrees. You can specify a new number of miters for the angle if needed.
Number of Miters (30-60)
Specifies the number of miters for a turn of 30-60 degrees. You can specify a new number of miters for the angle if needed.
Number of Miters (60-90)
Specifies the number of miters for a turn of 60-90 degrees. You can specify a new number of miters for the angle if needed.
Branch Vanes
Defines the number of vanes in a branch.
Turning Vanes
Defines the number of vanes in a turn.
Vane Length
Defines the length of vanes.
Remember Working Plane
Allows you to choose whether the software remembers the last used working plane. False clears the last selected plane so that you must reset the plane each time that you begin routing. True remembers the last used working plane. The software then remembers your selection and locks each route onto the plane. The default option is False.
When Remember Working Plane is set to False, the default plane option for Route Duct 
is No Plane. Each time that you click a routing command, the system clears the last selected
Plane option. You must reset the plane option each time that you begin a route.
However, you can set the default behavior to remember the last used working plane by setting Remember Working Plane to True. The software then locks the route onto the plane that you are using and remembers your selection within that session only.
This option is available when you are routing duct, piping, cableways, and conduits.
Setting this option to True when you are in any of these tasks results in an automatic True setting for all tasks. Likewise, setting this option to False when you are in any of these tasks results in an automatic False setting for all tasks.