The Ontario Building Code | Area Increase for Unprotected Openings
22.214.171.124. Area Increase for Unprotected Openings
(1) Except as required by Sentence 126.96.36.199.(8), the maximum area of unprotected openings in any exposing building face or fire compartment 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 188.8.131.52., or
(b) wired glass assemblies conforming to MMAH Supplementary Standard SB-2, "Fire Performance Ratings".