Sec. 2. The following must be equipped with at least two (2) bilge ventilators fitted with cowls, or the equivalent, and designed and constructed to permit the safe diffusion into the air of all inflammable or explosive gases:
(1) An inboard motorboat that uses motor fuel having a flash point of not more than one hundred ten degrees (110°) Fahrenheit, as determined by a tagliabue or equivalent closed cup test device.
(2) The greater part of the bilge of a motorboat that is not at all times open and exposed to the air.