11. Number of means of egress: (1) A floor area shall be served by at least 2 exits. A floor area that is no more that one storey above or below the ground floor may be served by only one exit, provided that:
(a) the area does not exceed 230 m2;
(b) the occupant load does not exceed 60;
(c) the exit leads directly to the outside;
(d) the distance to the exit does not exceed 15 m.
(2) (Paragraph revoked).
(3) In case of emergency, should one of the exits become inaccessible, the total number of units of exit width shall not be reduced by more than 50%.
(4) There shall be at least 2 means of egress for:
(a) any part of floor area or mezzanine intended for an occupancy of more than 60 persons;
(b) any part of floor area exceeding 120 m2 in any building of non-combustible construction or for any part of floor area exceeding 100 m2 in other buildings;
(c) (subparagraph revoked);
(d) (subparagraph revoked);
(e) any room containing stationary machinery requiring close supervision; a ladder or a metal stairway leading directly to a public thoroughfare or an open space leading to a public thoroughfare or an approved open space by means of a flap-door may be considered as the equivalent of a means of egress;
(f) any portion of floor area occupied by hazardous, explosive, flammable or poisonous substances, because of the risks arising from the nature, the quantity, the storage and the protection of such substances.
(5) In any assembly occupancy, a stairway serving a balcony above the first balcony shall be independent of other stairways and surrounded by a fire separation.