Those spaces and trunks to such spaces which contain either:
1. Internal combustion machinery used for the main propulsion,
2. Internal combustion machinery used for purpose other than the main propulsion where such machinery has in the aggregate a total power output of not less than 375 kW, or
3. Any oil-fired boiler or oil fuel unit, or any oil-fired equipment other than boilers, such as inert gas generators, incinerators, etc, (SOLAS).