(1)
The temperature rise limits and glass area limits required by Articles 3.1.8.17. and 3.1.8.18. are waived for a closure between an exit enclosure and an enclosed vestibule or corridor, provided
(a)
the vestibule or corridor is separated from the remainder of the floor area by a fire separation having a fire-resistance rating not less than 45 min,
(b)
the fire separation required by Clause (a) contains no wired glass, glass block or safety glazing within 3 m of the closure into the exit enclosure, and
(c)
the vestibule or corridor contains no occupancy. (See Note A-3.1.8.19.(1))