All uninspected motor vessels constructed after 25 April 1940, which use fuel with a flash point of 110°F (43°C) or less, shall have at least what number of ventilator ducts for the removal of explosive or flammable gases from every engine and fuel tank compartment?

Correct Answer: Option B — 2

46 CFR regulations mandate that uninspected vessels utilizing low flashpoint fuels must install at least two natural or mechanical ventilation ducts equipped with cowls in every engine and fuel tank compartment to safely remove explosive vapors.