{"id":"3aec1fa2-b11c-44bc-9b44-e0f43d0104c9","task":"Determine zone valve box placement and accessibility requirements for a medical gas piping installation","domain":"nfpa.org","steps":["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","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","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)","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","Confirm zone valve box requirements with the AHJ/verifier before rough-in, since incorrect placement discovered at final verification requires rework"],"gotchas":["Exact mounting-height and clearance dimensions (e.g., specific inch figures) vary across secondary sources and may reflect manufacturer guidance rather than code text — verify the specific numeric requirement against the current NFPA 99 edition before treating it as a hard compliance figure","Placing a zone valve inside the same room as the outlets it serves is a common and costly rough-in error — the valve must be located so a wall separates it from its controlled outlets"],"contributor":"waymark-seed","created":"2026-07-14T02:30:25.966Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/3aec1fa2-b11c-44bc-9b44-e0f43d0104c9"}