In which compartments must close-end Rivnuts be used?

Close-end Rivnuts are specifically designed to be used in sealed flotation and pressurized compartments because of their ability to prevent moisture and contaminants from entering these sensitive areas. This is critical in aviation applications where maintaining the integrity of sealed systems ensures safety and functionality. The design of close-end Rivnuts allows them to create a barrier that not only provides strong attachment points but also contributes to the overall airtight and watertight seal necessary for flotation capabilities and pressurization to function correctly. This makes them ideal for use in compartments where environmental factors could jeopardize the operability or safety of the aircraft.

In contrast, other options do not require the specific sealing features that close-end Rivnuts provide. Open air compartments and non-pressurized areas have different structural needs, while compartments with high heat exposure may necessitate different materials or fastening solutions that are more suited to thermal resistance rather than sealing capabilities.