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* Floor, ceiling and walls of the engine room
* Bulkheads and doors in living spaces
* [[HullInterior#Interior Fittings|Isolating all wall panels from structural boat walls]]
In addition to the noise of combustion, there are several considerations in designing acoustical-isolation systems for an engine room. These are drive-train vibration, especially from the propeller, the peak frequencies generated by large noise generators such as the engine, and the range of noise to which the ear is most sensitive.