Autodesk 235B1-05A761-1301 User Guide - Page 216
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If you want to... then... calculate size for oval or rectangular duct based on a fixed height accept the detected value for Capacity, or enter a 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 value for Capacity, or enter a value for Capacity. Specify a size for Width, and click for Height. You can change the width and recalculate the height repeatedly until you achieve a desirable duct size. calculate duct size using a single outlet flow device that is not yet connected to the duct click and select a single outlet device. The flow value of the outlet device is specified for Capacity. Click . calculate duct size by using multiple outlet flow devices that are not yet connected to the duct click and select multiple outlet devices. The Capacity value is increased by the combined flow values of the selected devices. Click . For more information, see Specifying a Calculation Method for Duct Sizing on page 182. 7 You can select Use Rise/Run and enter a value in degrees to continue drawing the duct at an upward or downward angle. 8 Click Use Routing, and then select a routing method: If you want to... then... draw with a predefined elbow angle select an elbow angle. define your own elbow angle in the drawing area select User Defined, and specify a point for the elbow angle. You can draw either with or without the Compass. define your own elbow angle in the dialog enter a value for the elbow angle. update the Elbow Angle options to select elbow angles from the catalog select Show Catalog for Elbow Angle. To optimize drawing performance, elbow angles from the catalog are hidden by default. hide the Elbow Angle options from the catalog in order to increase drawing performance select Hide Catalog. draw with only the selected elbow angle click the Lock icon next to Elbow Angle. The next segments you draw will have the same elbow angle. draw with both an elbow angle and a rise or drop to a specific elevation click the Preferences icon, and then click the Routing tab. Deselect Automatically create riser at new Elevation, and then click OK. Enter an elevation and draw the segment with an elbow angle. save drawing performance and not display the elbow as you draw with a specified elbow angle click the Preferences icon, and then click the Routing tab. Deselect Preview Elbow when Compass is Enabled or Preview Elbow when Compass is Disabled. 198 | Chapter 6 Drawing HVAC Systems
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