Fire and Smoke Protection Features
The rated-construction family
Chapter 7 is a vocabulary test: fire walls (706), fire barriers (707), fire partitions (708), smoke barriers (709), smoke partitions (710), horizontal assemblies (711), shaft enclosures (713), penetration firestopping (714), fire-resistant joint systems (715), opening protectives (716) and duct/air-transfer openings (717).
Fire wall: highest-rated element, structurally independent, continuous from foundation to roof, with each side treated as a separate building for area. Fire barrier: used for occupancy separations, exit enclosures and shafts; must be continuous and supported by construction having at least the same rating. Fire partition: corridor walls and dwelling/sleeping-unit separations; continuity requirements are less onerous. Smoke barrier: a 1-hour membrane with smoke-tight joints, used for areas of refuge and institutional smoke compartments.
Opening protectives and finish
Table 716.1(2) links wall rating to door assembly rating; a 1-hour rated wall generally needs a 45-minute (¾-hour) labeled assembly, and 20-minute assemblies are permitted only in the limited cases the table's footnotes allow. Chapter 8 sets interior finish classes by flame spread: Class A 0–25, Class B 26–75, Class C 76–200, with a smoke-developed index limit of 450 where required.
The traps
Fireblocking (concealed spaces in walls, at floor/ceiling levels) versus draftstopping (concealed combustible attic and crawl spaces) is a perennial question. Also watch fire dampers versus smoke dampers, and "fire-resistance rating" (assembly) versus "fire-protection rating" (opening protective).
Worked rule of thumb
When a question gives a room and asks for separation, identify the function first: an occupancy separation is a fire barrier; a corridor wall is a fire partition; a refuge area boundary is a smoke barrier. The label drives the rating and the opening protective.