Cleanroom Airflow Velocity Calculator
Enter total airflow (CFM) and HEPA filter area (sq ft) to instantly display the average face velocity in feet per minute. This tool helps cleanroom certifiers quickly verify that a unidirectional system’s filter face velocity meets ISO 5 limits, specifically the target range of 70 to 110 FPM.
Note: This calculator provides preliminary estimations and is not a substitute for review by a qualified/licensed engineer. It specifically determines average filter face velocity in ISO 5 cleanrooms where standard FPM (feet per minute) targets range strictly from 70 to 110 FPM.
How to Use This Calculator
- Enter the total airflow in cubic feet per minute (CFM).
- Enter the filter area in square feet.
- Watch the velocity update immediately.
- Compare the result to the 70–110 FPM ISO 5 target range.
- If needed, use the related hepa‑filter‑ceiling‑coverage‑ratio‑calculator to refine your design.
FAQ
Q1: What is the target FPM range for ISO 5 cleanrooms?
A: ISO 5 cleanrooms target 70–110 FPM, as defined by ISO 14644‑1.
Q2: Is this calculator sufficient for final certification?
A: No, it is only a preliminary estimation and must be reviewed by a qualified/licensed engineer.
Q3: What units should I use for total flow?
A: Enter total flow in cubic feet per minute (CFM).
Q4: How does the tool handle zero area input?
A: It displays an error and prevents calculation to avoid division by zero.