What kind of ventalation system does an Inboard gasoline boats built after July 31st 1980 need?

Inboard gasoline boats built after July 31, 1980, require a ventilation system that includes both natural and mechanical ventilation to prevent the accumulation of explosive vapors. The system must have at least two air inlets and one outlet, ensuring proper air circulation within the engine compartment. Additionally, the mechanical ventilation must operate automatically when the engine is running and should be capable of exchanging the air in the compartment at least once every three minutes. This is crucial for enhancing safety and compliance with U.S. Coast Guard regulations.