AIR VELOCITY TEST BY USING AIR CAPTURE HOOD
ISO 14644 is a series of international standards that define the requirements for cleanrooms and controlled environments. It specifies various parameters and test methods to evaluate the performance of cleanrooms, including air velocity.
To conduct an air velocity test using an air capture hood in accordance with ISO 14644, you can follow these general steps:
Equipment and Preparation:
- Ensure that the air capture hood you’re using is calibrated and suitable for the required measurements.
- Familiarize yourself with the specific requirements and guidelines outlined in ISO 14644 for air velocity testing.
Set Up the Test:
- Position the cleanroom or controlled environment to be tested in a stable condition.
- Ensure that the ventilation system is operating normally and is representative of typical conditions.
- If necessary, install temporary airflow straighteners or baffles to achieve a uniform airflow profile before the measurement location.
Select Test Locations:
- Determine the number and locations of measurement points based on the size and configuration of the cleanroom, as specified in ISO 14644.
- Identify appropriate locations for measurements, considering factors such as air supply outlets, return air grilles, and critical work areas.
- Place the air capture hood at each designated measurement point, following the manufacturer’s instructions.
- Ensure that the air capture hood is oriented correctly and covers the entire measurement area.
- Record the measured air velocity at each location, ensuring sufficient time for stabilization and averaging if required by ISO 14644.
- Depending on the specific requirements of ISO 14644, you may need to repeat the measurements multiple times at each location.
- Take into account variations in airflow conditions, including changes in the ventilation system operation and other environmental factors.
- Compare the measured air velocities with the specified limits defined in ISO 14644 for the class of cleanroom being tested.
- Identify any deviations or non-compliance with the standard’s requirements.
- Document the results, including the measured values, location details, and any observations or discrepancies.
It’s important to note that the above steps provide a general outline for conducting an air velocity test using an air capture hood in accordance with ISO 14644. However, it is crucial to consult the specific requirements and guidelines outlined in ISO 14644-3 or other relevant parts of the standard for detailed instructions and any specific deviations or additional steps required for your particular situation.