On Land

Environment Information
At Rill Architects we run ArchiCAD on macOS. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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M Fixt
Non-ceiling mechanical fixtures, such as floor registers. Shows in mechanical plan, or in the floor plan if you don't have a mechanical plan and you want to show the registers. (We did this on Stevens.)

M Fixt Clg2
Ceiling mechanical fixtures, such as ceiling registers or returns. Shows in mechanical plan and reflected ceiling plan.

M Equip
Mechanical equipment, such as furnaces, air handlers, water heaters. Shows in mechanical plan, electrical plan, floor plan, and section. If you don't want a particular element to show in section, turn the 3D off in the object.