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Drafting with Flow Direction
Flow direction is the forward movement of a material or fluid (such as air or water) through the components
of a system. You can set or reverse the flow direction of a duct run or a pipe run between 2 branches. Once
you set the flow direction, you can show it using flow markers, toggling the markers on and off as needed.
The flow markers are solid 2D arrows displayed at the midpoint of segments.
Flow markers indicating the flow direction of
a pipe run
NOTE In addition to flow markers, you can also add flow labels (sometimes referred to as flow arrows in the
software) to duct runs and pipe runs. Like flow markers, flow labels show the current flow direction of the run if
the flow direction has been set, and they are scaled according to the annotation scale. Unlike flow markers, flow
labels are fully annotative objects, which means you can modify and delete them. For information on adding flow
labels as you draw, see
Pipe
on page 317.
To set or reverse the flow direction of a duct or pipe run
1 Select a segment in the run.
2 Click Duct tab
You can perform the same operation on a pipe run using Set Flow Direction on the Pipe tab.
3 The current flow direction of the run is shown by an arrow in the center of the selected segment.
4 Do one of the following:
118 | Chapter 4 Drawing Essentials
Adding Labels or Flow Arrows to Ducts
Calculations panel
If the run does not have an assigned flow direction, the start point of the segment is considered
upstream, and a default flow direction is shown.
Enter y (yes) to reverse the flow direction.
on page 177 or
Adding Labels or Flow Arrows to
Set Flow Direction
.
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