PURPOSE: To verify that a differential pressure should be maintained between the rooms sufficient to assure airflow outward progressively from the cleanest spaces to the least clean during normal operation and during periods of temporary upsets in air balance, as when a door connecting two (2) rooms is suddenly opened.
INSTRUMENTATION: Shortridge - Calibration documents for equipment used in testing are included in certification report.
PROCEDURES: With all doors closed and the air handling systems operating at design capacity, measure the pressure differential (in inches water gauge) between the Cleanroom and surrounding areas. Record direction of pressurization, differential pressure in inches water gauge and report all data in test report.
ACCEPTANCE: Pressurization and uniformity requirements are a matter for agreement between buyer and seller.