Stairwell Pressurization Calculator
The Stairwell Pressurization Calculator finds the design pressure differential and total leakage area for a pressurised stairwell. Example: for two stairwells in a 10-floor office pressurised to code, Design pressure = 50 Pa, Total leakage area = 0.71 m², Doors = 10 (per NFPA 92:2021).
How it works
Computed from your inputs per NFPA 92:2021.
Worked example (Fire Protection)
Inputs: two stairwells in a 10-floor office pressurised to code.
| Result | Value |
|---|---|
| Design pressure | 50 Pa |
| Total leakage area | 0.71 m² |
| Doors | 10 |
Computed live by WorkHive's calculation engine; standard: NFPA 92:2021.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses two stairwells in a 10-floor office pressurised to code.
- The calculator returns Design pressure, Total leakage area, Doors, computed per NFPA 92:2021.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a stairwell pressurization fan calculator NFPA 92?
The Stairwell Pressurization Calculator is a free online tool that computes finds the design pressure differential and total leakage area for a pressurised stairwell. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following NFPA 92:2021. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Stairwell Pressurization Calculator in WorkHive: free, no sign-up needed for the calculators.