Maximum CSST length on blocks

Maximum CSST length on blocks

• A. 60 inches
• B. 30 inches
• C. 54 inches
• D. 48 inches

Answer: (D)

CSST on masonry surfaces has a defined maximum exposed length to manage damage risk and ensure proper protection and support. The allowed maximum is four feet, which keeps the tubing within a manageable span where clamps, shields, and supports can be installed reliably and where the tubing is less likely to be punctured by nails, screws, or sharp edges in blocks. If a longer run is needed, it should be routed through protective channels or replaced with rigid piping in sections, following the manufacturer’s instructions and NFPA 54. The other lengths either exceed what’s permitted or aren’t the recognized maximum.

CSST on masonry surfaces has a defined maximum exposed length to manage damage risk and ensure proper protection and support. The allowed maximum is four feet, which keeps the tubing within a manageable span where clamps, shields, and supports can be installed reliably and where the tubing is less likely to be punctured by nails, screws, or sharp edges in blocks. If a longer run is needed, it should be routed through protective channels or replaced with rigid piping in sections, following the manufacturer’s instructions and NFPA 54. The other lengths either exceed what’s permitted or aren’t the recognized maximum.