All motorboats, except open boats, which use gasoline or any other fuel which has a flash point of one hundred ten degrees (110^o) Fahrenheit or less must have at least two (2) ventilator ducts, fitted with cowls or their equivalent, for the efficient removal of explosive or flammable gases from the bilges of every engine and fuel tank compartment.

At least one (1) exhaust duct must be installed that extends from the lower portion of the bilge to the open atmosphere.

At least one (1) intake duct must be installed that extends from the open atmosphere to a point that is either at least midway to the bilge or at least below the level of the carburetor air intake.

Cowls must be located and trimmed for maximum effectiveness in preventing displaced fumes from being recirculated.

The ventilation requirements listed above do not apply to a fuel tank compartment which:

Contains only permanently-installed fuel tanks;

Vents to the open atmosphere; and

Contains only electrical components which are ignition-protection in accordance with U. S. Coast Guard requirements.

All vessels built after July 1, 1980, except open boats, which have a gasoline engine that is used for electrical generation, mechanical power, or propulsion must have a ventilation system that meets the requirements of Subpart K of 33 C.F.R. Part 183.

NOTE: FOR A MORE COMPREHENSIVE LISTING OF THE BOATING REGULATIONS, PICK UP A COPY FROM ANY DIVISION OF MOTOR VEHICLES OR DIVISION OF NATURAL RESOURCES OFFICE.