Fire rating is related to the materials used and the openings they cover. You may use sheetrock/gypsum/plasterboard in various thicknesses to make a fire-resistant wall up to two hours. You may need inter-stud firestops, and you may need to take care of any windows, doors, or other openings through the fire rated partition. Your local building or fire code will specify how thick the layers must be, and the other details.
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M1 Fire Rating
Blue Fire - 2002 is rated/received certificates of: USA:Open
Yes, you can shorten fire rated doors, but edges have to be re-lipped. Fire doors are tested to keep out fire for a set time (usually 30mins). A 24'' fire door will keep out the fire just as long as a 33'' door, its the construction that matters most, delaying fire going from front of door through to the otherside.
Beyond the Fire - 2009 is rated/received certificates of: UK:15
The Fire Fighters - 1930 is rated/received certificates of: Argentina:Atp USA:Approved