The Airflow Pattern Test is a key part of cleanroom validation, making sure that air is flowing the right way to remove dust, particles, and contaminants effectively.

Let’s simply understand this important test!

What is the Airflow Pattern Test?

The Airflow Pattern Test checks the movement of air inside a cleanroom. It ensures that clean air flows smoothly and carries contaminants away without creating dead zones or allowing dirty air to flow back into clean areas.

How is the Test Done?

The process is simple but powerful:

1️⃣ Use Smoke or Fog:

A smoke generator or fog machine is used to release a visible mist inside the cleanroom.

This mist acts like a tracer that shows how the air moves.

2️⃣ Observe Airflow:

The movement of the smoke is either visually monitored or recorded using a camera.

This helps identify how air is flowing across workspaces, walls, ceilings, and equipment.

3️⃣ Check for Issues:

Pass: If the airflow moves properly — either in a smooth (laminar) or controlled random (turbulent) pattern — it’s good.

Fail: If there are dead zones (where air isn’t moving) or backflow (air moving in the wrong direction), it needs fixing.

Types of Airflow in Cleanrooms

Laminar Flow:

Air moves in one uniform direction, usually downward.

Typically used in high-grade cleanrooms, such as ISO 5 or Class 100 environments.

Turbulent Flow:

Air moves randomly but still effectively mixes and removes particles. Suitable for less stringent cleanroom classifications.

Equipment Used for the Test

Smoke Generator (Fog Machine):

Produces visible smoke to trace airflow patterns easily.

Camera/Video Recorder:

Captures smoke movement, helping with detailed analysis later.

Why is the Airflow Pattern Test Important?

Keeps Contamination Under Control:

Ensures clean air removes particles and dust efficiently.

Validates System Performance:

Ensures that HEPA filters, ULPA filters, and air handling units are operating effectively.

Supports Compliance:

Necessary for meeting ISO standards, GMP guidelines, and other regulatory requirements.

Final Thoughts

The Airflow Pattern Test is simple, visual, and critical for cleanroom validation. By ensuring the right airflow patterns, you protect your cleanroom’s performance, maintain product quality, and stay compliant with industry standards.

Clean air. Correct flow. Contamination under control.