{

"constants": {
  "infiltration_rate_m3_per_s_per_m2": {
    "data_type": "value",
    "refs": [
      "PCF 1414"
    ],
    "value": 0.0015,
    "units": "m3/s/m2",
    "notes": "Air tightness at 75 Pa as would be measured in a test (i.e. normalised by entire building air barrier area). This is converted to apply to the above grade surfaces only as per the code."
  }
}

}