Uninspected motor vessels constructed after...

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Question 1 of 2066636ee728f7522a1c518e0a

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

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Question 1 of 20

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🔍 Key Concepts

• 46 CFR requirements for uninspected vessels using flammable fuel • Difference between inlet (supply) vents and outlet (exhaust) vents • Purpose of ventilator ducts in engine and fuel tank compartments

💭 Think About

• How many separate paths are needed to move fresh air in and flammable vapors out of a compartment? • Does the regulation require both an intake and exhaust duct, or just one type of duct? • Think about how air actually circulates in a confined engine space—would a single duct be enough to clear vapors from the bilge area?

✅ Before You Answer

• Verify in 46 CFR what is required specifically for fuel with a flash point of 110°F (43°C) or less • Check whether the rule specifies “at least” a certain number of ducts per compartment • Confirm if the regulation distinguishes between supply and exhaust ventilators and whether both are counted in the minimum number.

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