Div. B › Part 3 › 3.1 › 3.1.9 — Penetrations in Fire Separations and Fire-Rated Assemblies

3.1.9.5 — Openings through a Membrane Ceiling

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(1) A membrane ceiling forming part of an assembly assigned a fire-resistance rating on the basis of MMAH Supplementary Standard SB-2, “Fire Performance Ratings”, is permitted to be penetrated by openings leading into ducts within the ceiling space provided,

(a) the ducts are sheet steel, and

(b) the amount of openings and their protection conform to the requirements of MMAH Supplementary Standard SB-2, “Fire Performance Ratings”.

(2) Fire stop flaps in ceiling membranes required in Sentence (1) shall conform to CAN/ULC-S112.2, “Fire Test of Ceiling Firestop Flap Assemblies”.

OBC Definitions

Defined terms on this page

fire stop

means a system consisting of a material, component and means of support, used to fill gaps between fire separations or between fire separations and other assemblies, or used around items that wholly or partially penetrate a fire separation.

fire stop flap

means a device, (a)that is intended for use in horizontal assemblies that are required to have a fire-resistance rating and incorporate protective ceiling membranes, and (b)that operates to close off a duct opening through the membrane in the event of a fire.

fire-resistance rating

means the time in minutes or hours that a material or assembly of materials will withstand the passage of flame and the transmission of heat when exposed to fire under specified conditions of test and performance criteria, or as determined by extension or interpretation of information derived from that test and performance as prescribed in this Code.

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