Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Light Diffusers and Lenses

9.10.17.8. light Diffusers and Lenses

(1) light diffusers and lenses having flame-spread ratingsthat exceed those permitted for the ceiling finish, shall conform to the requirements of Sentence 3.1.13.4.(1).

In Plain Language

Light diffusers and lenses used in ceiling fixtures have flame-spread related requirements set out in this article, since these plastic components can otherwise contribute to fire spread.

This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.