Building Infiltration Calculator
Observed independently calibrated building volume×air changes/hour infiltration volume/hour, not blower door-to-natural conversion or forecast. Actual independently established compatible SI units/model context; conditional arithmetic, not code compliance, engineering design or safe operation approval.
Description
An observed air-change estimate combines building air volume with a matched rate per hour.
An observed air-change estimate combines building air volume with a matched rate per hour.1
This tool calculates volume per hour without converting a blower-door test into natural infiltration.
When to use Building Infiltration Calculator
Use this tool to calculate volume per hour without converting a blower-door test into natural infiltration.
How to use Building Infiltration Calculator and how it works
- Prepare actualBuildingAirVolumeCubicMeters, callerIndependentObservedAirChangesPerHour, with the units, conventions and assumptions below.
- Enter the required fields and run Building Infiltration Calculator.
- Read result.value using the output definitions below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualBuildingAirVolumeCubicMeters | Actual Building Air Volume Cubic Meters. Use the units and matching context stated in the calculation below. | number | Required; nonnegative; finite; other constraints below |
| callerIndependentObservedAirChangesPerHour | Caller Independent Observed Air Changes Per Hour. Use the units and matching context stated in the calculation below. | number | Required; nonnegative; finite; other constraints below |
Supply nonnegative building volume in cubic meters and nonnegative air changes per hour. Return their product in cubic meters per hour. The tool does not infer leakage, weather effects or ventilation adequacy.
flowCubicMetersPerHour=buildingVolume*airChangesPerHour Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Air volume flow in cubic meters per hour. | number |
{
"input": {
"actualBuildingAirVolumeCubicMeters": 10,
"callerIndependentObservedAirChangesPerHour": 2
},
"output": {
"result": {
"value": 20
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Steam Pipe Heat Loss Calculator for a complementary operation: Steam-pipe heat loss depends on geometry, insulation and a complete thermal-resistance model.
Use Building U-Value Calculator for a complementary operation: A plane multilayer U-value is the reciprocal of total areal thermal resistance, including specified surface films.
References
-
Building Infiltration Calculator — tool.io
Similar or alternative tools
- Steam Pipe Heat Loss Calculator
Steam-pipe heat loss depends on geometry, insulation and a complete thermal-resistance model.
- Building U-Value Calculator
A plane multilayer U-value is the reciprocal of total areal thermal resistance, including specified surface films.