{
  "id": "safety/co-detector-placement-height",
  "signature": "AI tells a homeowner to install a carbon monoxide detector near the floor because CO is heavier than air, or to place it in a closet or behind furniture",
  "signature_zh": "AI告诉房主将一氧化碳探测器安装在地板附近，因为CO比空气重，或将其放在壁橱或家具后面",
  "regex": "(carbon monoxide|CO detector|CO alarm).*(floor|height|placement|install|closet|behind furniture)",
  "domain": "safety",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "Carbon monoxide is slightly lighter than air (density 0.967 relative to air), so it mixes uniformly; detectors should be placed at breathing height (5 feet from floor) on a wall or ceiling, away from obstructions, not near the floor.",
  "root_cause_type": "generic",
  "root_cause_zh": "一氧化碳比空气略轻（相对密度0.967），会均匀混合；探测器应安装在呼吸高度（距地板5英尺）的墙壁或天花板上，远离障碍物，而不是靠近地板。",
  "versions": [],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "CO is actually slightly lighter than air; it mixes uniformly. Floor placement misses detection at breathing level, delaying alarm. Standard recommendation is at breathing height (5 ft) or on ceiling.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Obstructions block airflow, preventing CO from reaching the sensor quickly. Detectors need unobstructed air circulation to function properly. Closets also may not have enough air movement.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Drafts from windows or vents can dilute CO concentration near the detector, causing delayed or missed alarms. Keep away from windows, doors, and HVAC vents.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Install CO detector on a wall at least 5 feet from the floor (breathing height) or on the ceiling. Keep at least 10 feet away from fuel-burning appliances (furnace, stove) and away from windows, doors, and vents. Test monthly and replace batteries annually.",
      "success_rate": 0.95,
      "how": "Install CO detector on a wall at least 5 feet from the floor (breathing height) or on the ceiling. Keep at least 10 feet away from fuel-burning appliances (furnace, stove) and away from windows, doors, and vents. Test monthly and replace batteries annually.",
      "condition": "",
      "sources": []
    },
    {
      "action": "For combination smoke/CO detectors: follow manufacturer instructions; typically mount on ceiling or high on wall. Do NOT place in corners, near bathrooms (steam), or in direct sunlight.",
      "success_rate": 0.9,
      "how": "For combination smoke/CO detectors: follow manufacturer instructions; typically mount on ceiling or high on wall. Do NOT place in corners, near bathrooms (steam), or in direct sunlight.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Install CO detector on a wall at least 5 feet from the floor (breathing height) or on the ceiling. Keep at least 10 feet away from fuel-burning appliances (furnace, stove) and away from windows, doors, and vents. Test monthly and replace batteries annually.",
    "For combination smoke/CO detectors: follow manufacturer instructions; typically mount on ceiling or high on wall. Do NOT place in corners, near bathrooms (steam), or in direct sunlight."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.nfpa.org/education-and-research/electrical-safety/carbon-monoxide-detectors",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.91,
  "fix_success_rate": 0.93,
  "resolvable": "true",
  "first_seen": "2024-11-01",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}