Piping for an A2L system installed inside a wall or floor, where it passes through joists or studs, must be:

Piping for an A2L system installed inside a wall or floor, where it passes through joists or studs, must be:

• A. Painted red
• B. Protected by a strike plate or shielding
• C. Flushed with water
• D. Mounted on uninsulated surface

Answer: (B)

When A2L refrigerant piping runs inside walls or floors and crosses joists or studs, it must be protected by a nail plate or shielding. This protection prevents nails, screws, or fasteners used for wall or floor finishing from striking and puncturing the pipe, which could cause a refrigerant leak and create a flammable exposure in concealed spaces. The protective plate is a simple, effective safeguard that maintains the integrity of the piping through the build’s structure. Painting the pipe red isn’t required for this situation and doesn’t provide physical protection. Flushing with water doesn’t relate to installation protection, and mounting on an uninsulated surface would not address the risk of fastener damage.

When A2L refrigerant piping runs inside walls or floors and crosses joists or studs, it must be protected by a nail plate or shielding. This protection prevents nails, screws, or fasteners used for wall or floor finishing from striking and puncturing the pipe, which could cause a refrigerant leak and create a flammable exposure in concealed spaces. The protective plate is a simple, effective safeguard that maintains the integrity of the piping through the build’s structure. Painting the pipe red isn’t required for this situation and doesn’t provide physical protection. Flushing with water doesn’t relate to installation protection, and mounting on an uninsulated surface would not address the risk of fastener damage.