In a drawing, rise symbols and drop symbols are used to represent vertically-oriented segments and fittings, and to indicate corresponding rises and drops in elevation in the layout. In AutoCAD MEP 2022 toolset , a rise condition exists if an unconnected end on a vertically oriented segment or fitting is visible in the current view. If the segment or fitting is vertically oriented but does not have a visible, unconnected end, a drop condition exists. Rise/drop styles let you specify the symbols to use in both rise and drop conditions.
A rise/drop style defines not only the symbols to use, but also the 2-line and 1-line displays in which to use them. For duct rise/drop styles, you can also specify different symbols for different shapes of ducts and fittings: round, rectangular, and oval.
Rise/drop styles are used in the orthographic views: Top, Bottom, Left, Right, Front, and Back.
1-line display of a pipe run
You can specify a rise/drop style for each system in a drawing. For example, you can specify one style for a supply system and a different style for a return system. This helps to visually differentiate the systems, as shown in the following plan view of a supply run and a return run, both with vertical components.
Supply duct run
Return duct run
Before you define a rise/drop style, you need to create the AutoCAD blocks that will represent the rise symbols and drop symbols. Keep the following guidelines in mind as you create the blocks: