Determine zone valve box placement and accessibility requirements for a medical gas piping installation

Steps

1. Confirm a wall must intervene between the zone valve and the outlets/inlets it controls, and that a single zone valve serves only outlets/inlets on the same story
2. Confirm the valve box must be installed where it remains visible and accessible at all times — not hidden behind normally open/closed doors, not installed inside the room containing the outlets it controls, and not in lockable or closeable spaces
3. Confirm the valve must be readily operable from a standing position at an accessible mounting height (verify the exact height limit and any code-specified clearance dimensions against the current NFPA 99 edition text and/or the project's AHJ, since cited figures vary across secondary sources)
4. Confirm any required clear/unobstructed access space in front of the valve box per the current code text and coordinate with architectural/mechanical room layout to avoid obstruction
5. Confirm zone valve box requirements with the AHJ/verifier before rough-in, since incorrect placement discovered at final verification requires rework