Revit MEP System Run Selection

Revit MEP has a different method for resizing ducts and pipes. In AutoCAD MEP, you select a single duct (or pipe) and specify a new size and then the software asks whether you want to resize the run up to the next junction or to include a transition. This is potentially asked twice if the duct (or pipe) is connected to a run at both ends. Revit MEP differs in that if you want to re-size a run of ducts or pipes, you explicitly select which ducts or pipes are to be modified. To simply this process, there is a procedure for a selecting a run of ducts or pipes. First select the start of the run:Then select the end of the run while holding down the Tab key: You can now specify the new size in the Options Bar: http://www.autodesk.co.uk/adsk/servlet/item?siteID=452932&id=10502615&linkID=8678924