3.1.8.12. Twenty-Minute Closures

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3.1.8.12. Twenty-Minute Closures

1) A door assembly having a fire-protection rating not less than 20 min is permitted to be used as a closure in

a) a fire separation not required to have a fire resistance rating more than 1 h, located between

i) a public corridor ans a suite,

ii) a corridor and adjacent sleeping rooms, or

iii) a corridor and adjacent classrooms, offices and libraries in Group A, Division 2 major occupancies, or

b) a fire separation not required to have a fire-resistance rating more than 45 min, located in a building not more than 3 storeys in building height.

2) The requirements for noncombustible sills and combustible floor coverings in NFPA 80, "Fire Doors and Other Opening Protectives," do not apply to a door described in Sentence (1)

3) A door described in Sentence (1) shall have clearances of not more than 6 mm at the bottom and not more than 3 mm at the sides and top.