9.9.4.6.

(1) This Article applies to,

(a) exit doors serving other than single dwelling units, and

(b) exit doors serving single dwelling units where there is no second and separate exit from the dwelling unit.

(2) Where an exterior exit door described in Sentence (1) in one fire compartment is within 3 m horizontally of an unprotected opening in another fire compartment and the exterior walls of these fire compartments intersect at an exterior angle of less than 135°, the opening shall be protected with wired glass in fixed steel frames or glass block conforming to Articles 9.10.13.5. and 9.10.13.7. or with a rated closure conforming to Table 9.10.13.1.v1 with respect to the rating of the fire separation between the two compartments.