I'm designing a system with sprinklers at the ceiling of a large open space. There is a vestibule within this space that has a lower ceiling that requires 3 sprinklers. The client does not want pipe drops or hangers above the vestibule to be visible from the rest of the open space.
The proposed solution is to run a branchline down the wall and horizontal tight to the ceiling. Is there a good way to support this that meets the requirements of NFPA 13 chapter 9? The vestibule has CMU walls and metal stud ceiling.
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