The Ontario Building Code | Fuel Supply Shut-off Valves and Exhaust Pipes
188.8.131.52. 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.