The Ontario Building Code | Service Rooms and Ancillary Spaces
3.13.3.3. service Rooms and Ancillary Spaces
(1) An ancillary space in a rapid transit station shall be separated from the remainder of the floor area by a fire separation having a fire-resistance rating not less than 1 h.
(2) Except as provided in Sentence (3), a door opening from a service room onto a means of egressin a rapid transit station shall be located not less than 5 m from an escalator balustrade and from the top and bottom riser of a flight of stairs used as a means of egress from the rapid transit station.
(3) The requirements in Sentence (2) do not apply where,
(a) the service room is sprinklered, or
(b) there is a vestibule between the service room and the means of egress.
(4) Where a door from a service room opens onto a means of egress less than 5 m wide,
(a) the service room shall be sprinklered, or
(b) there shall be a vestibule between the service room and the means of egress.
In Plain Language
An ancillary space in a rapid transit station must be separated from the rest of the floor area by a fire separation rated at least 1 hour, and doors from service rooms or ancillary spaces have specific additional requirements.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.