{
  "kind": "Authored native frequency-band table and hypothetical comparison",
  "frequencies_Hz": [
    125,
    250,
    500,
    1000,
    2000,
    4000,
    8000
  ],
  "selected_assembly": "Fibrous glass or mineral wool with aluminum or stainless jacket under adopted covering method",
  "density_lbm_ft3": {
    "fibrous_glass": [
      6,
      8
    ],
    "mineral_wool": [
      8,
      10
    ]
  },
  "rows": [
    {
      "thickness_in": 1,
      "reduction_dB": [
        0,
        0,
        3,
        12,
        21,
        30,
        35
      ]
    },
    {
      "thickness_in": 2,
      "reduction_dB": [
        0,
        0,
        5,
        14,
        23,
        32,
        35
      ]
    },
    {
      "thickness_in": 3,
      "reduction_dB": [
        0,
        1,
        8,
        16,
        25,
        34,
        35
      ]
    }
  ],
  "hypothetical_target": {
    "frequency_Hz": 500,
    "required_reduction_dB": 8,
    "2in_listed_reduction_dB": 5,
    "3in_listed_reduction_dB": 8,
    "disposition": "Only the listed3in row meets this comparison on the adopted covering basis; no installed exposure acceptance"
  },
  "low_frequency_counterexample": {
    "frequency_Hz": 125,
    "all_listed_reductions_dB": 0,
    "disposition": "Listed thickening does not solve this band; evaluate another mechanism or qualified construction"
  },
  "limits": [
    "No genericdBperinch law/interpolation or addition of separatefrequencybands",
    "STCmaterialbarrierrating is not this installedcover reduction",
    "Thermalmaterial/temperature/jacket/support/openings/access separately evaluated"
  ]
}