Two important measurements in assessing air performance are the Air Velocity (Flow) Test and the ACPH (Air Changes Per Hour) calculation.

What is the Air Velocity (Flow) Test?

The Air Velocity Test is used to measure the speed of air moving through supply or exhaust points, like ducts, grilles, or HEPA filters. It helps calculate the total airflow of a system.

Units of Measurement:

• Meters per second (m/s)

• Feet per minute (FPM)

What Equipment is Used?

To perform the air velocity test accurately, the following tools are commonly used:

• Anemometer – Vane or hot-wire type for capturing air velocity

• Measuring tape or laser measurer – For calculating duct or grille area

• Calculator or software – To convert readings into airflow values like CFM (Cubic Feet per Minute) or CMH (Cubic Meters per Hour)

What is ACPH (Air Changes Per Hour)?

ACPH tells us how many times the air inside a room is completely replaced in one hour. It is a key indicator of ventilation quality in controlled spaces.

Why These Tests Matter

• Ensures a Clean Environment: Keeps contaminants and particles under control

• Compliance-Ready: Essential for audits under ISO, GMP, and WHO standards

• Improves HVAC Efficiency: Helps design and optimize air handling systems

• Protects Products & Personnel: Especially critical in pharma, electronics, and hospitals

How It’s Useful

• Supports air quality control and cleanroom validation

• Detects airflow imbalances or blockages early

• Ensures proper operation of HEPA filters and exhaust systems

• Validates whether a space meets its required ACPH standards

Need Professional Testing?

At Aimtech Systems LLP, we provide expert Air Flow Testing and ACPH Calculation Services with:

• Certified, calibrated equipment

• Detailed validation reports

• Experienced technicians