(1) Except as provided in Section 3.5. and Articles 3.6.3.3. and 3.6.3.5., a vertical service space shall be separated from all other portions of each adjacent storey by a fire separation having a fire-resistance rating conforming to Table 3.6.3.1. for the fire-resistance rating required by Subsection 3.2.2. for,
(a) the floor assembly above the storey, or
(b) the floor assembly below the storey, if there is no floor assembly above. (2) A vertical service space that does not extend through the roof of a building shall be enclosed at the top with construction having a fire-resistance rating not less than that required for the vertical service space walls. (3) A vertical service space that does not extend to the bottom of a building shall be enclosed at the lowest level with construction having a fire-resistance rating not less than that required for the vertical service space walls. (4) A vent from a vertical service space not extending to the roof shall be enclosed within the building with construction having a fire-resistance rating not less than that required for the vertical service space walls. (5) Only openings that are necessary for the use of the vertical service space shall be permitted through a vertical service space enclosure.