{
  "id": "shielding:shielding-window-film",
  "collection": "shielding",
  "slug": "window-film",
  "name": "RF-attenuating window film",
  "summary": "A metallised film bonded to glazing, typically quoted at 20–35 dB, and usually the highest-value single intervention because glass is the dominant entry path for outdoor RF.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "EMF window film",
      "metallised film",
      "solar shielding film"
    ],
    "form": "film",
    "attenuation": {
      "value": 20,
      "max": 35,
      "band": "roughly 900 MHz – 6 GHz, datasheet values",
      "sourceIds": [
        "sbm-2024"
      ]
    },
    "targets": [
      "radiofrequency"
    ],
    "requiresGrounding": false,
    "failureModes": [
      "Attenuates mobile reception inside the room as well, which is often discovered after installation",
      "Frame and reveal leakage limits the achievable result; film stops at the glass edge",
      "Some films void glazing warranties or cause thermal stress on toughened units",
      "Low-E glazing already provides significant attenuation, so the marginal gain can be small — measure first"
    ],
    "related": [
      "emitters:macro-cell-tower",
      "emitters:5g-small-cell"
    ]
  },
  "sources": [
    {
      "id": "sbm-2024",
      "title": "Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)",
      "publisher": "Institut für Baubiologie + Nachhaltigkeit (IBN)",
      "url": "https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf",
      "year": 2024,
      "kind": "ngo",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/shielding/window-film",
    "html": "https://emfbase.com/shielding/window-film",
    "markdown": "https://emfbase.com/shielding/window-film.md",
    "collection": "https://emfbase.com/api/shielding"
  }
}