Hull Construction Regulations (C.R.C., c. 1431)

93 (1) In passenger launches in excess of 15.25 m in length the propelling machinery shall be separated from the other spaces by a bulkhead or casing; such bulkhead or casing shall be of watertight construction in way of bilges and so constructed above the bilge as to serve as an efficient firebreak; the propelling machinery shall, when located in an open cockpit, be covered by a covering or casing so constructed as to serve as an efficient firebreak.

(2) Any enclosed space occupied by the propelling machinery or oil fuel tanks shall be efficiently ventilated to remove any possible accumulation of flammable or explosive vapour; to meet this requirement there shall be provided adequate inlet and outlet ventilation extending to the bilges, the inlet ventilation leading to the forward end of the space and the outlet ventilation leading to the after end of the space; in all cases the arrangement shall be to the satisfaction of a steamship inspector.

(3) Where gasoline is used as fuel, the outlet ventilation duct from the machinery space shall be fitted with an exhaust fan; the electric motor for the exhaust fan shall be situated outside the machinery space and outside the ventilation duct but, where this is not practicable, an explosion proof motor may be fitted within the machinery space but not within the ventilation duct; in any case, the switch for operating the exhaust fan shall be located outside the machinery space; a suitable notice shall be displayed at the main engine controls indicating that the main engine shall not be started until the exhaust fan has operated for a sufficient period to ensure that the machinery space has been cleared of any accumulation of flammable or explosive vapour; generally the fan shall be operated for at least five minutes before starting the main engine.