It's the Law

Ventilation Systems

The purpose of ventilation systems is to avoid explosions by removing flammable gases.

All gasoline-powered vessels, constructed in a way that would entrap fumes, must have at least two ventilation ducts fitted with cowls to remove the fumes.

If your vessel is equipped with a power ventilation system, turn it on for at least four minutes both after fueling and before starting your engine.

If your vessel is not equipped with a power ventilation system (for example, a PWC), open the engine compartment and sniff for gasoline fumes before starting the engine.

Ventilation system
Properly installed ventilation systems greatly reduce the chance of a life-threatening explosion.