If you are using Revit MEP, you might be thinking about your HVAC plans and wondering should you use a floor plan (which looks down and excludes the ceiling grid) or a Ceiling plan (which looks up and seems to invert which duct is actually on top when duct cross).
Here is what I have come up with so far.
I use both.
I model in the ceiling plan view because I need the ceiling grid to place my diffusers and miss the lights fixtures. Then I annotate in the floor plan view which I place on the sheet. There I have the correct orientation of duct.
I never print the ceiling grid. This comes from having AutoCAD drawings in which my ceiling grid and the architects often were different. I guess that is not such a problem with Revit, but I have become accustom to not printing it. In AutoCAD I would make it no plot, so I can reference it. Modeling in the ceiling plan view handles that.
Every firm is different, but this way is an idea. Post a comment to let me know what you do.