The Ontario Building Code | Fuel Supply Shut-off Valves and Exhaust Pipes
3.2.7.7. Fuel Supply Shut-off Valves and Exhaust pipes
(1) If a liquid or gas fuel-fired engine or turbine for an emergency electric power supply is dependent on a fuel supply from outside the building, the fuel supply shall be provided with a suitably-identified separate shut-off valve outside the building.
(2) Where pipes for exhaust gases from emergency power systems penetrate required fire separations, they shall be enclosed in a separate service space having a fire-resistance rating equal to that of the penetrated floor assembly, but not less than 45 min.
In Plain Language
This clause addresses emergency power requirements for ventilation and smoke control systems, ensuring these systems continue functioning to keep exit routes clear of smoke even if normal power is lost.
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.