Stairwell Pressurization Calculator
Static · formula-only · worked example computed when this page was built · no live data
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, Leakage area per stairwell = 0.71 m², Doors per stairwell = 10 (per NFPA 92:2021).
How it works
Computed from your inputs per NFPA 92:2021. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Fire Protection)
Inputs: two stairwells in a 10-floor office pressurised to code.
| Result | Value |
|---|---|
| Design pressure | 50 Pa |
| Leakage area per stairwell | 0.71 m² |
| Doors per stairwell | 10 |
Computed by WorkHive's calculation engine when this page was built; standard: NFPA 92:2021.
How to use this calculator
- Read the worked example. It uses two stairwells in a 10-floor office pressurised to code and shows every number in the method.
- Follow the formula with your own figures: it returns Design pressure, Total leakage area, Doors, computed per NFPA 92:2021.
- To compute interactively, open the Stairwell Pressurization Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a stairwell pressurization fan calculator NFPA 92?
The Stairwell Pressurization Calculator is a free online tool that 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 is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). 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, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.