🔍 Key Concepts

• Exhaust system safety requirements for small passenger vessels in 46 CFR Subchapter T • Protection of passengers and crew from burn hazards and fumes/water • Why backflow of water into an engine exhaust is dangerous for the machinery

💭 Think About

• Think about what could happen if seawater were able to flow backward through an exhaust line into the engine—what kind of damage or failure could that cause? • Consider where people walk, sit, or work onboard: what protections are needed if very hot exhaust piping runs through those areas? • If a dry exhaust exits near the waterline at the stern, what possible risks exist if it is too close to the centerline or too low?

✅ Before You Answer

• Look for requirements that deal with preventing water from entering the engine through the exhaust • Check if there are rules about shielding or guarding hot surfaces where people can come into contact with them • Verify whether placement of a dry exhaust outlet at the transom has any specific requirement about being outboard or away from certain areas