Examples
Examples
Try the starting example
- Vent opening width (cm)
- 20
- Vent opening height (cm)
- 10
- Measured mesh/free-area fraction
- 0.6
- Identical openings
- 2
- Net free opening area (cm²)
- 240
- Gross opening area (cm²)
- 400
Try another scenario
- Vent opening width (cm)
- 22
- Vent opening height (cm)
- 10
- Measured mesh/free-area fraction
- 0.6
- Identical openings
- 2
- Net free opening area (cm²)
- 264
- Gross opening area (cm²)
- 440
Calculation method
Calculation method
Net free opening area (cm²)
Net=width×height×freeAreaFraction×count.
Gross opening area (cm²)
Net=width×height×freeAreaFraction×count.
Symbols and units
- a
- Vent opening width (cm)
- b
- Vent opening height (cm)
- c
- Measured mesh/free-area fraction
- d
- Identical openings
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Net geometric area only; no ventilation adequacy, gas appliance or occupied-space compliance claim. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Net geometric area only; no ventilation adequacy, gas appliance or occupied-space compliance claim.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.