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9.10.5.1.(4) | Application | Intent |
| OS1 | OP1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Openings, leading to ducts within a ceiling space,
that pierce a membrane ceiling forming part of an assembly assigned a fire-resistance rating on the basis of Table A-9.10.3.1.B. or
Appendix D, where the ducts, the amount of openings and their protection conform
to the requirements of Appendix D. This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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| Intent | Intent 1: To exempt openings leading to ducts from the requirements
of Sentence 9.10.5.1.(1), which would otherwise not permit openings in
rated ceiling membranes, if certain conditions are met [i.e. the ducts, the
amount of openings and their protection conform to the requirements of Appendix
D]. This is to limit the probability that openings into
rated ceiling membranes will contribute to the spread of fire within the ceiling
space, which could lead to the premature failure or collapse of the structure
within the ceiling space, which could lead to harm to persons.
Intent 2: To make the provisions in Appendix D mandatory with respect
to:
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