Fire ratings for commercial building involve a mirad of different wall and ceiling rated assemblies.
This link by USG provides you with that information and will be able to recognize the assembly at times in your Commercial Inspections.
Learn to recognize the assembly at times by the thickness of the walls at doorways and other openings. Knowing the wall material framing widths normally used for your area will be a good clue as to what was used for a firerated material surface.
This is a 6.1 MB file.