3.4.4.3 — Exterior Passageway Exceptions

(1) Except as required by Sentence (3) and as permitted by Sentence 3.4.4.3. (1), if the plane of an exterior wall of an exit enclosure forms an angle less than 135 with the plane of an exterior wall of the building it serves, and an opening in the exterior wall of the exit enclosure could be exposed to fire from an opening in the exterior wall of the building, the opening in either the exterior wall of the exit or the exterior wall of the building shall be protected in conformance with the requirements of Sentence (4) where the opening in the exterior wall of the building is within 3 m horizontally and, (a) less than 10 m below an opening in the exterior wall of the exit, or (b) less than 2 m above an opening in the exterior wall of the exit. (2) If an unenclosed exterior exit stair or ramp could be exposed to fire from an opening in the exterior wall of the building it serves, the opening in the exterior wall of the building shall be protected in conformance with the requirements of Sentence (4) where the opening in the exterior wall of the building is within 3 m horizontally and, (a) less than 10 m below the exit stair or ramp, or (b) less than 5 m above the exit stair or ramp. (3) Except as permitted by Sentence 3.4.4.3. (1), if an exterior exit door in one fire compartment is within 3 m horizontally of an 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 in conformance with the requirements of Sentence (4). (4) The opening protection referred to in Sentences (1) to (3) shall consist of, (a) glass block conforming to the requirements of Article 3.1.8.14., (b) a wired glass assembly conforming to MMAH Supplementary Standard SB-2, “Fire Performance Ratings”, or (c) a closure conforming to the requirements of Subsection 3.1.8. and Articles 3.2.3.1. and 3.2.3.14.

(1) Except as provided by Sentences (2) and (5) and Sentences 3.3.5.4. (3), 3.4.4.2. (2), 3.4.4.3. (1) and 3.13.3.1. (3), every exit shall be separated from the remainder of the building by a fire separation having a fire-resistance rating not less than that required by Subsection 3.2.2., but not less than 45 min, for, (a) the floor assembly above the storey, or (b) the floor assembly below the storey, if there is no floor assembly above. (2) The fire-resistance rating of the fire separation referred to in Sentence (1) need not be more than 2 h. (3)[[NO_FORMULA]] Revoked: O. Reg. 89/23, s. 11 (2). (4) If an exit stair in an assembly hall or theatre serves more than one balcony level, the exit stair shall be separated from the remainder of the building in conformance with Sentence (1). (5) The path of exit travel may lead from an exit door or exit enclosure through open air parking that is located below a roof or floor assembly that is part of the building served by the exit door or exit enclosure where, (a) the portion of the path of exit travel that leads through the open air parking is not more than 9 m in length measured from the exit door to a point at ground level at the perimeter of the building, (b) measures are taken to prevent vehicles intended to park in spaces adjacent to the path of exit travel from encroaching on the path of exit travel, and (c) an alternate means of egress not leading through the open air parking is available from the interior side of the door opening onto the path of exit travel through the open air parking area.