The Ontario Building Code | Service Facilities
3.10.2.6. service Facilities
(1) Except as provided in Sentence (2), the requirements in Section 3.6. shall apply.
(2) Except where located in and serving only the dwelling units, a fuel-fired appliance shall be located in a service room separated from the remainder of the building by a fire separation having a fire-resistance rating not less than 1 h.