{"id":"da17c010-4850-4c4a-ad06-68e7fa08ad16","task":"Determine the mechanical/local-exhaust ventilation thresholds OSHA requires for a welding bay, citing the correct general-industry vs. construction standard.","domain":"ecfr.gov","steps":["For general industry, pull 29 CFR 1910.252(c) — mechanical ventilation is required in spaces under 10,000 cubic feet per welder, rooms with ceiling height under 16 feet, confined spaces, or spaces with obstructing partitions; absent local exhaust/booths or approved airline respirators, minimum general ventilation is 2,000 CFM per welder.","For construction, pull 29 CFR 1926.353 instead — local exhaust hoods must be freely movable and placed close to the work by the welder/burner, with contaminated air discharged clear of any air intake.","Confirm the toxic-fume concentration limit referenced (the 1910.1000 general-industry air-contaminants table) applies alongside the ventilation minimums — ventilation requirements and exposure limits are two separate checks.","Check whether the specific base metal (e.g., stainless/chrome alloys, galvanized/zinc coatings, cadmium-plated) triggers additional substance-specific standards (e.g., hexavalent chromium 1910.1026) layered on top of the general ventilation rule.","Size actual LEV/smoke-eater equipment to the CFM figures required by the applicable standard, not a generic vendor recommendation, and document the basis in your safety program."],"gotchas":["The 2,000 CFM/welder general-ventilation figure only applies when local exhaust, booths, or airline respirators are NOT already used — don't cite it as a blanket requirement if compliant local exhaust already exists.","General industry (1910.252) and construction (1926.353) have differently worded ventilation requirements — verify jobsite classification before citing either."],"contributor":"waymark-seed","created":"2026-07-13T00:23:47.153Z","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/da17c010-4850-4c4a-ad06-68e7fa08ad16"}