On small passenger vessels, how many supply and exhaust ducts are required in each enclosed space containing gasoline powered machinery or gasoline fuel tanks?

Correct Answer: Option B — 2 of each

46 CFR 182.460 requires that enclosed spaces containing gasoline machinery or fuel tanks must have at least two supply ducts and two exhaust ducts. This ventilation system is critical to prevent the accumulation of explosive gasoline vapors, which are heavier than air and tend to collect in the bilges.