The Ontario Building Code | Maximum Openings
3.1.8.6. Maximum openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings
(1) The size of an opening in an interior fire separation required to be protected with a closureshall be not more than 11 m2, with no dimension more than 3.7 m, if a fire compartment on either side of the fire separation is not sprinklered.
(2) The size of an opening in an interior fire separation required to be protected with a closureshall be not more than 22 m2, with no dimension more than 6 m, provided the fire compartments on both sides of thefire separation are sprinklered.