Object Elevation MEASUREMENTS

[Anonymous]

Can someone explain to me how Revit calculates elevation?  For example; I was drawing a duct run in a section and when the duct passed through a wall the elevation level changed from 12' ?? to 25' ??, the duct line did not change it was still a straight line just the definition of the elevation changed. 

Another example I inserted a Trane air handler into the Revit model and when I interrigated the equipment for elevation the response was 1' 6 3/4", which normally would be fine except that IT WAS ON TOP OF A BUILDING ON THE ROOF!

Do I need to manually set the elevations for each view and for all of the duct / piping runs through the building?

I welcome any information to help me understand how Revit does this.

TB

[CoreyDaun]

The "Offset" value of Ducts and other elements is measured from it's Host Level. This can be changed under the Element's Properties via the parameter "Level" (for typical Families) or "Reference Level" (for System Families like Duct). When creating new elements, this value is inherited from the View in which the element is created.

[Anonymous]

If I unserstand you correctly, the associated level when creating the object is a baseline elevation.  So if it is associated with "Level 2" the duct elevation would be approximately 10 to 12 feet (depending how much space is above the drop ceiling)?  LIkewise if the same object is associated with "Level 1" the "Object Offset" would be the distance from floor to floor plus the 10 to 12 feet to be above the drop ceiling, correct?

If the above is trun that would explain why I can go through a wall that is open fromt the first floor to the underside of the roof...

TB