3.3.5.7. Vestibules

(1)

If access is provided through a fire separation between a storage garage and a Group A, Division 1 or Group B occupancy or a retirement home, the access shall be through a vestibule conforming to Sentence (4).

(2)

Reserved.

(3)

In a building more than 3 storeys in building height, access through a fire separation between a storage garage and a Group A, Division 2, 3 or 4, or a Group C occupancy, shall be through a vestibule conforming to Sentence (4).

(4)

If access is provided through a vestibule, as required by Sentences (1), (3) and 3.3.5.4.(1), the vestibule shall

(a)

be not less than 1.8 m long,

(b)

be ventilated

(i)

naturally to outside air by a vent that has an unobstructed area of not less than 0.1 m2 for each door that opens into the vestibule but not less than 0.4 m², or

(ii)

mechanically at a rate of 14 m3 /h for each square metre of vestibule floor surface area, and

(c)

have openings between the vestibule and an adjoining occupancy provided with self-closing doors with no hold-open devices.