{
  "page": "/us/lifespan/attic-fan",
  "built_from": "data/lifespan/facts/attic-fan.json",
  "rows": [
    {
      "type": "Roof Vents, powered — Family (apartment-building planning table)",
      "measure": "standard estimated useful life",
      "value": 20,
      "unit": "years",
      "source": "U.S. Department of Housing and Urban Development, CNA e-Tool Estimated Useful Life Table",
      "url": "https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf",
      "data_years": "Numbering by ASTM 2018-08 Outline, no issue date",
      "read": "2026-11-02",
      "area": "national, multifamily",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "hud-eul-roof-vents-powered-family"
    },
    {
      "type": "Roof Vents, powered — Elderly (apartment-building planning table)",
      "measure": "standard estimated useful life",
      "value": 20,
      "unit": "years",
      "source": "U.S. Department of Housing and Urban Development, CNA e-Tool Estimated Useful Life Table",
      "url": "https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf",
      "data_years": "Numbering by ASTM 2018-08 Outline, no issue date",
      "read": "2026-11-02",
      "area": "national, multifamily",
      "n": "not published by the source",
      "se_points": null,
      "fact_id": "hud-eul-roof-vents-powered-elderly"
    },
    {
      "type": "Attic exhaust fans used — US single-family households",
      "measure": "weighted share",
      "value": 12.7,
      "unit": "percent of households",
      "source": "U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7",
      "url": "https://www.eia.gov/consumption/residential/data/2020/xls/RECS%202020%20Codebook%20for%20Public%20File%20-%20v7.xlsx",
      "data_years": "2020",
      "read": "2026-11-02",
      "area": "national",
      "n": 14070,
      "se_points": 0.3,
      "fact_id": "recs2020-atticfan-yes-us"
    },
    {
      "type": "Attic exhaust fans used — Florida (state) single-family households",
      "measure": "weighted share",
      "value": 8.4,
      "unit": "percent of households",
      "source": "U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7",
      "url": "https://www.eia.gov/consumption/residential/data/2020/xls/RECS%202020%20Codebook%20for%20Public%20File%20-%20v7.xlsx",
      "data_years": "2020",
      "read": "2026-11-02",
      "area": "Florida",
      "n": 469,
      "se_points": 1.1,
      "fact_id": "recs2020-atticfan-yes-fl"
    }
  ]
}