Overcast

{
  "id": "MLC-T-IND-004064",
  "term": "Overcast",
  "field": "Industrial and trades",
  "definition": "An enclosed airway, also called an air bridge, built to carry one current of air over another in an underground mine without the two airstreams mixing. This structure is a component of the mine's ventilation system, allowing fresh intake air to be routed to working areas while contaminated return air is directed toward an exhaust shaft. Overcasts are constructed from materials like concrete blocks, steel, or shotcrete.",
  "subject": "Mining and extraction",
  "translations": {
    "de": "Übergang",
    "es": "paso elevado",
    "fr": "passage supérieur"
  },
  "url": "https://mlchart.com/terminology/industrial/overcast/"
}