Autodesk 235B1-05A761-1301 User Guide - Page 251
Modifying the Size or Shape of a Duct, To modify the size or shape of a duct segment, If you want
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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 ➤ Modify panel ➤ Duct Modify . 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... then... calculate size for round duct accept the detected flow value for Capacity, or enter a flow value for Capacity. Click . The calculated duct size is displayed for Diameter. calculate size for oval or rectangular duct based on a fixed height 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 repeatedly until you achieve a desirable duct size. calculate size for oval or rectangular duct based on a fixed width 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 repeatedly until you achieve a desirable duct size. For more information, see Specifying a Calculation Method for Duct Sizing on page 182. 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... then select... modify the entire run to match the parameters of the selected segment Resize Branch to a Junction/Transition. insert a transition fitting to connect the duct or duct fitting without changing the entire run Add Transition Fitting. 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. Modifying Duct | 233
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