The CRF2 Cleanroom Fogger uses 10 ultrasonic devices to produce 0.26 cubic meters per minute with 57 ml of fog density to provide 7-8 feet of visual airflow in fume hoods, bio-safety cabinets, glove boxes; while the CRF4 Cleanroom Fogger uses 35 ultrasonic devices to produce 1.25 cubic meters fog per minute with 170ml fog density to provide 10-15 feet visual airflow in small cleanrooms, ISO suites and sterile rooms. Fog is used in smoke studies to visualize airflow patterns and turbulence in Pharmaceutical ISO suites, sterile rooms, medical rooms and semiconductor clean rooms; providing compliance to USP 797 Pharmaceutical In-situ Airflow Analysis, Airflow Recovery Tests in ISO 14644-3, Visualization Tests for ISO 14644-3 Annex B7, NSF 49 for Bio-Safety Cabinets and Federal Standards 209E for semiconductor clean rooms.