Ventilation Systems 2.7

In motorized vessels, flammable gases can gather. These have the potential to create a powerful and extremely dangerous explosion. As such, a proper ventilation system is required for all vessels built after 1940 and powered by gasoline. Ventilation systems can be natural or powered:

NATURAL VENTILATION SYSTEMS
Minimum of 2 ventilator ducts (1 intake duct, 1 exhaust duct) fitted with cowls (hooded opening) to remove stagnant fumes.

POWERED VENTILATION SYSTEMS
Required on vessels built after July 31, 1982 with installed fuel tanks or an enclosed engine. Consists of 1 or more exhaust blowers.

NOTE: Ensure intake ducts are located above the normal accumulation of bilge water. Turn on the powered ventilation system for FOUR minutes before you start the engine, to ensure all gasoline vapors have been removed before ignition.

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