Modifying The Size Or Shape Of A Duct - Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010 User Manual

To enhance visual clarity in a drawing, you can assign hatching patterns to ductwork to easily identify
different duct systems. For example, you can assign hatching patterns to ductwork that will be demolished
as part of a building modification.

Modifying the Size or Shape of a Duct

Use this procedure to change the shape or size of a duct segment. You can change one segment at a time,
or you can resize the entire run. When changing a single segment, you need to add a transition in order to
adjust it to the rest of the run. You can also calculate duct sizes using the instant sizing tool.
To modify the size or shape of a duct segment
1 Select the segment.
2 Click Duct Flex tab or Duct tab
3 In the Modify Duct dialog, specify the duct shape for Shape.
4 Specify new sizes. You can manually select sizes or calculate them using the instant sizing tool:
If you want to...
calculate size for round duct
calculate size for oval or rectangular duct based
on a fixed height
calculate size for oval or rectangular duct based
on a fixed width
For more information, see
5 In the Maintain Connection dialog, specify a method to re-establish a valid connection between
the segment and the rest of the run:
If you want to...
modify the entire run to match the parameters of the
selected segment
insert a transition fitting to connect the duct or duct
fitting without changing the entire run
If you have chosen to modify an entire run that is connected to another run, the junction fitting
that connects the 2 runs is replaced. The correct transition fitting is inserted in its place to
maintain a valid connection at that junction.
Modify panel
Specifying a Calculation Method for Duct Sizing
Duct Modify
then...
accept the detected flow value for Capacity, or enter a flow
value for Capacity. Click
The calculated duct size is displayed for Diameter.
accept the detected flow value for Capacity, or enter a flow
value for Capacity. Specify a size for Height, and click
for Width.
You can change the height and recalculate the width re-
peatedly until you achieve a desirable duct size.
accept the detected flow value for Capacity, or enter a flow
value for Capacity. Specify a size for Width, then click
for Height.
You can change the width and recalculate the height re-
peatedly until you achieve a desirable duct size.
on page 182.
then select...
Resize Branch to a Junction/Transition.
Add Transition Fitting.
.
.
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