🔍 Key Concepts

• 46 CFR engine room machinery requirements for internal combustion engines • Purpose of crankcase ventilation and explosion prevention • Fire and explosion safety features on engine crankcases

💭 Think About

• Which option directly reduces the risk of fire or explosion inside the crankcase? • Which item would reasonably be required on every crankcase vent outlet, regardless of engine size or vessel type? • Which choices are useful but would more likely be located somewhere OTHER than the vent outlet itself?

✅ Before You Answer

• Identify which choice is specifically a safety device against flame propagation. • Eliminate any options that are operational or convenience items rather than mandated safety fittings. • Consider which device would be constructed of non‑corrosive material because it is always exposed to oil mist and vapors at the vent outlet.