The Ontario Building Code | Maximum Openings

3.1.10.5. Maximum openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings

(1) openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings in a firewall shall conform to the size limits described in Article 3.1.8.6. and the aggregate width of openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings shall be not more than 25% of the entire length of the firewall.