What would the prefix be for an insulated pipe in a gypsum wallboard wall?

The prefix for an insulated pipe in a gypsum wallboard wall is identified as W-L-5XXX. In this context, the "W" indicates that the assembly is for walls, while "L" designates that the firestop system has been tested according to specific standards for penetrations. The "5XXX" portion of the designation is indicative of an insulated pipe, specifically focusing on the type of materials and conditions involved in the firestop system.

The designation system is important because it enables professionals to quickly identify the compatibility of various firestop materials and methods with the types of constructions and insulation they are dealing with. Each designation carries specific information about the firestop assembly, including the types of penetrants, the materials used, and the testing standards met.

In this case, the other choices correspond to different configurations, assemblies, or conditions that are not specifically for insulated pipes within gypsum wallboard walls, thus making them less relevant for this particular question. Using the correct prefix ensures compliance with fire safety regulations and promotes effective firestop installation and performance.