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Ontario Building Code

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Volume 1

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Division B

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Part 3

3.2.3.12. Area Increase for Unprotected Openings

Feb 03, 2026© King's PrinterJan 16, 2025

(1)

Except as required by Sentence 3.2.3.7.(5), the maximum area of unprotected openings in any exposing building face of a building that is not sprinklered is permitted to be doubled if the openings are glazed with

(a)

glass block conforming to the requirements of Article 3.1.8.16., or

(b)

wired glass assemblies conforming to MMAH Supplementary Standard SB-2, “Fire Performance Ratings.” (See Note A-3.2.3.12.(1)) (See A-2.3.15. of SB-2)

  • (1)
  • (a)
  • (b)

Mentioned in

  • 3. Fire Protection, Occupant Safety and Accessibility
  • 3.2.3.1. Limiting Distance and Area of Unprotected Openings
  • 3.2.3.7. Construction of Exposing Building Face

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