Concealed gas piping can be installed in solid walls if placed in which of the following?

Concealed gas piping can be installed in solid walls if it is placed in chases or casings. The use of chases or casings is critical because they provide a protective barrier around the gas piping. This helps in managing the potential hazards associated with gas leaks, as it minimizes the risk of damage to the piping from other construction processes or materials. Additionally, chases allow for the safe and organized routing of gas lines, ensuring that they are accessible for maintenance or inspection while being hidden from view.

Chases typically refer to the elongated spaces that are specifically designed within walls to accommodate piping, and casings provide structural support and protection. This installation method adheres to building codes and safety regulations that dictate how gas piping should be installed to mitigate risks. Other options, while they might refer to protective or housing structures, do not align with the established industry standards for gas piping installation within solid walls.