The Ontario Building Code | Openings through a Membrane Ceiling

3.1.9.5. openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings through a Membrane ceiling

(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="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings leading into ducts within the ceiling space provided,

(a) the ducts are sheet steel, and

(b) the amount of openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings and their protection conform to the requirements of MMAH Supplementary Standard SB-2, "Fire Performance Ratings".

(2) Fire stop flapsin ceiling membranes required in Sentence (1) shall conform to CAN/ulc-S112.2, "Fire Test of ceiling Firestop Flap Assemblies".