The Ontario Building Code | Guards
(1) Except as required by Sentences (2) to (4) for bleacher seats, guards shall be installed in outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">door and indoor places of assembly with fixed seats so that,
(a) at the fascia of every box, balcony or gallery where the seats extend to the edge, the height of guards is not less than,
(i) 760 mm in front of the seats, and
(ii) 920 mm if located at the end of aisles or at the foot of steps,
(b) the height of guards along every cross aisle other than those adjacent to the fascia of every box, balcony or gallery is not less than 660 mm, except that guards need not be provided if the backs of the seats along the front side of the aisle are not less than 600 mm above the floor of the aisle, and
(c) where the seating is arranged in successive tiers and the height of rise between platforms is more than 450 mm, the height of guards is not less than 660 mm along the entire row of seats at the edge of the platform.
(a) not less than 1 070 mm high above an adjacent aisle surface or foot rest, and
(b) not less than 920 mm high above the centre of an adjacent seat board.
(4) openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings through any guard that is required by Sentences (2) and (3) shall be of a size that will prevent the passage of a sphere having a diameter more than 300 mm.