Refrigerant piping penetrates a fire-rated wall. What should determine the permitted annular space and sealing details?
- AA universal one-inch gap for every wall
- The approved firestop system for that wall, penetrant and installation
- CAny unsealed three-inch gap
- DOnly the pipe color
Where to look it up
https://www.ul.com/news/firestop-systems-important-line-defense-fire-safety
Why B is correct
Use an approved firestop system matching the wall assembly and piping penetration. Its installation details govern the annular space and seal. A generic gap or filler does not demonstrate that the wall rating is maintained.