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■Increased intelligence in routing filters most relevent parts in the ChooseA Part dialog.Pipe Catalog■The Pipe Catalog has an extensive new collection of fittings and more sizeshave been added on existing fittings.Engineering Units■■■In the Drawing Setup dialog box, HVAC tab, determine and set the airflowunits, friction units, and velocity units from their respective drop-downlists.These units of measurements are determined by the drawing units (imperialor metric) selected in the Units tab of the Drawing Setup dialog box.The AecBDwgHVACSetup command displays the Drawing Setup dialogbox with the HVAC tab selected.Associative Array■In AutoCAD MEP, you cannot create associative array of custom objectssuch as ducts, pipes, MvParts, and so on, when they maintain relationshipwith other objects. If the objects selected to be arrayed include customobjects that maintains relationships with other objects, a task dialog isdisplayed where you can create a non-associative array of all objects orremove custom objects from the selection set to be arrayed. The MEPobjects that support associative array are Device and Panel.Elbow Transition■When creating elbow transitions for oval ducts, ensure that if OW1 (theoval width at insertion point) is greater than OH1 (the oval height atinsertion point), then OW2 (the oval width at the end point) must begreater than OH2 (the oval height at the end point) and vice versa. If thisis not maintained, an incorrect transition elbow model is created.Hide TakeOff Reduction Markers■Rectangle and oval ducts show reduction markers when you insert TakeOffs.You can hide the TakeOff reduction markers by turning off Annotationfrom the Properties palette.NOTETurning off Annotation also hides the vane symbols from the drawing.4 | Chapter 1 AutoCAD MEP 2012 Readme