Airflow uniformity tests are conducted to ensure that air is distributed evenly across a given space or system. These tests are crucial in industries such as HVAC, cleanrooms, aerodynamics, and industrial ventilation, where consistent airflow is essential for efficiency and performance.

1. Purpose of Airflow Uniformity Tests
Ensures even distribution of air to prevent hot spots or stagnation.
Maintains controlled environments (e.g., cleanrooms, laboratories, hospitals).
Optimizes system performance in HVAC, industrial ventilation, and aerodynamics.
Verifies compliance with industry standards (e.g., ISO 14644 for cleanrooms, ASHRAE for HVAC).

2. Key Parameters Tested
Velocity Distribution: Checks if airspeed is consistent across the test area.
Volume Flow Consistency: Ensures that airflow is maintained at the required rate.
Pressure Uniformity: Measures pressure variations in ducts or enclosures.
Temperature & Humidity Distribution: Important in HVAC and cleanroom applications.

3. Common Testing Methods
a. Air Velocity Mapping
Uses anemometers (hot-wire or vane) to measure airflow at multiple points.
Typically performed on grids across air diffusers, ducts, or cleanroom spaces.
Compares actual airflow with design specifications.
b. Smoke Visualization Tests
Uses smoke wands or fog generators to visually observe airflow patterns.
Helps identify dead zones, turbulence, or unwanted recirculation.
Common in cleanrooms, airflow hoods, and industrial ventilation.
c. Tracer Gas Testing
Introduces CO₂ or other non-toxic gases to track airflow movement.
Measures how efficiently air is replaced in a controlled environment.
Used in pharmaceutical and semiconductor cleanrooms.
d. Airborne Particle Testing (for Cleanrooms)
Uses laser particle counters to ensure airflow maintains particulate control.
Verifies compliance with ISO 14644-1 cleanroom classifications.

4. Standards & Guidelines for Uniformity Testing
ISO 14644 – Cleanroom airflow validation.
ASHRAE 110 – Fume hood containment testing.
ANSI/AIHA Z9.5 – Laboratory ventilation requirements.
SMACNA – Duct system air leakage and pressure testing.

5. Interpretation of Results
Uniform airflow → Consistent velocities and no turbulence.
Non-uniform airflow → Potential system design flaws, obstructions, or incorrect fan/duct sizing.
Excessive turbulence → Could lead to uneven cooling, contamination risks, or energy inefficiency.

6. Applications of Airflow Uniformity Testing
Cleanrooms & Labs: Ensures controlled environments for manufacturing.
HVAC Systems: Verifies airflow balance for energy efficiency.
Industrial Ventilation: Prevents hazardous gas buildup.
Data Centers: Ensures even cooling to prevent overheating.
Would you like a specific testing procedure or calculations for airflow uniformity?