3.2.6.6.

(1) The requirements of Sentences 3.2.6.2.(2) and (4) and Clause 3.2.6.2.(3)(a) are waived in a building of Group C major occupancy classification,

(a) where each suite above grade has direct access to an exterior balcony that conforms to the requirements of Sentence 3.3.1.7.(7),

(b) where each stairway that serves storeys above the lowest exit level is vented to the outdoors at or near the bottom of the stair shaft,

(c) where measures are taken to limit movement of smoke from a fire in a floor area below the lowest exit storey into upper storeys, and

(d) where, except for exhaust fans in kitchens, washrooms and bathrooms in dwelling units, air moving fans are designed and installed so that in the event of a fire such fans can be stopped by means of a manually operated switch at the central alarm and control facility where the system serves more than 2 storeys.

(2) The requirements of Sentences 3.2.6.2.(2) and (3) are waived in a Group C major occupancy apartment building.

(1) Means of venting each floor area to the outdoors shall be provided by windows, wall panels, smoke shafts or, except as provided by Sentence (5), the building exhaust system.

(2) Fixed glass windows shall not be used for the venting required by Sentence (1) if the breaking of the windows could endanger pedestrians below.

(3) Openable windows used for the venting required by Sentence (1) shall be permanently marked so that they are easily identifiable.

(4) Elevator hoistways shall not be designed for the venting required by Sentence (1).

(5) In a building that is not sprinklered, venting of floor areas required in Sentence (1) shall not be provided by the building exhaust system.