A cleanroom is a room in which the concentration of airborne particles is controlled to specific limits. They are classified by the numbers of particles per cubic meter per minute. Sizes of particles which are controlled usually range from 0.1 to 10 micrometers. Room classifications are described in ISO-14644-1; "Cleanrooms and associated controlled The Hood Guys Certification ironments-Part I-Classification of air cleanliness" They range from ISO Class I through 9.

Cleanrooms may be unidirectional (laminar), non-unidirectional (turbulent), or mixed airflow. Clients may choose from a variety of tests, depending upon their needs. A partial list from the ISO Standards 14644-1, 14644-2 and 14644-3-Test Methods, or Institute of The Hood Guys Certification ironmental Sciences and Technology document "IEST-RP-CC006.3 - Testing Cleanrooms" would include:

  • Airflow Velocity/Volume
  • HEPA Filter Leak Test
  • Particle Counts
  • Room Pressurization
  • Visual Airflow Characterization
  • Light Levels
  • Noise Levels
  • Temperature/Humidity
  • Vibration
  • Others

Depending upon the use of the cleanroom, testing and certification is usually performed at initial installation and at specified intervals. In the medical field, certification is performed semi-annually or annually. Electronics firms may have independent testing initially and whenever problems occur. But they are typically monitoring their rooms daily with in-house personnel.

THE HOOD GUYS CERTIFICATION is certified in "Cleanroom Performance Testing" according to NEBB (National The Hood Guys Certification ironmental Balancing Bureau) and has the experience and technical knowledge to test any cleanroom in the pharmaceutical, electronics, medical and food industries.