AS ISO 14644.3:2021 pdf download.Cleanrooms and associated controlled environments Part 3: Test methods.
4.2.3 Airflow direction test and visualization
The purpose of this test is to demonstrate that the airflow direction and its uniformity of velocity conform to the design and performance specifications. The airflow direction test can be conducted in the at-rest state to determine the basic cleanroom airflow patterns and can be repeated in the operational state simulating actual operations. Procedures for this test are given in B.3.
4.2.4 Recovery test
The recovery test is performed to determine whether the cleanroom or clean zone is capable of returning to a specified cleanliness level within a finite time, after being exposed briefly to a source of airborne particulate challenge. This test is not recommended for unidirectional airflow. The procedure for this test is given in B.4. When an artificial aerosol is used, the risk of residue contamination of the cleanroom or clean zone should be considered.
4.2.5 Temperature test
The purpose of this test is to verify the air temperature levels are within the control limits over the time period specified by the customer for the area being tested. Procedures for these tests are given in B.5.
4.2.6 Humidity test
The purpose of this test is to verify moisture (expressed as relative humidity or dew point) levels are within the control limits over the time period specified by the customer for the area being tested. Procedures for these tests are given in B.6.
4.2.7 Installed filter system leakage tests
These tests are performed to confirm that the final high efficiency air filter system is properly installed by verifying the absence of bypass leakage in the air filter installation, and that the filters are free of defects (small holes and other damage in the filter medium, frame, seal and leaks in the filter bank framework). These tests are not used to determine the efficiency of the filter medium. The tests are performed by introducing an aerosol challenge upstream of the filters and scanning downstream of the filters and support frame or sampling in a downstream duct. Leak detection methods are given in B.7.AS ISO 14644.3 pdf  download.