To determine the volume of air delivered through each HEPA filter and to calculate the average airflow, uniformity range and room air exchange rate, within the Cleanroom.INSTRUMENTATION:
Shortridge - Calibration documents for equipment used for testing will be included in the certification reports.PROCEDURES:
- Unidirectional Air Flow Test: Divide the work zone entrance into a grid of 2' x 2' sections. Test with the anemometer / Shortridge 12" below filters.
- Non-unidirectional Air Flow Test: Divide the filter into 2' x2' sections. Orient the anemometer perpendicular to the velocity flow vector being measured. The probe should be positioned at a distance of no more than 6" (15 cm) from the filter face.
- Airflow volume test using anemometer / Shortridge: Measure and record the linear flow rate and average the result(s). Multiply the average velocity by the effective filter area to arrive at total cubic volume.
- Airflow volume test when using a Balometer: The flow hood opening is placed completely over the filter or diffuser, seating the face of the hood against a flat surface to prevent air bypass and inaccurate readings. Measure and record the flow rate in cubic volume per minute for each filter or diffuser.
The average airflow velocity or the average or total airflow volume for the cleanroom of clean zone should be within ± of the value specified for the cleanroom or clean zone, or within other tolerance limits agreed upon by the buyer and seller.