Laminar Flow Hood Testing and Certification

Laminar flow hoods (LFHs) are designed to provide HEPA filtered unidirectional airflow to a work area in which clean, high quality applications and manipulations are required. The optimal design of a LFH is to protect the product from contamination.

CEM specializes in the testing, certification, repair and maintenance service of LFHs. All testing is provided with calibrated instrumentation in accordance with the appropriate industry test standard and /or guideline. CEM is an authorized service representative for most hood manufacturers.

CEM currently provides testing and certification for the following types of LFHs and associated HEPA filtration devices:

  • Horizontal Flow Clean Benches
  • Vertical Flow Clean Benches
  • Pharmacy Compounding Isolators
  • Clean Air Workstations
  • Cleanroom Unidirectional Zones

LFHs are tested and certified to meet guidelines as established by IEST-002, ISO 14644 and manufacturer’s specifications. The testing of each hood includes a custom report outlining the final results in detail.

Listed below are the services provided by CEM. Depending on the facility and related industry, the appropriate scope of testing shall apply.

Laminar Flow Hood Testing Services

Air Velocity Profile: Verifies the hood is providing the proper air balance to protect the product from contamination

Integrity Testing of HEPA filters: Assures the existing HEPA filters are free of leaks and are properly sealed to prevent leakage or possible contamination to the work area

Non-Viable Particle Counting: Testing provided to verify Cleanroom is meeting designed air cleanliness classification level per ISO 14644 specifications

Viable / Microbial Air Testing: Assures Bioburden levels for bacteria and/or fungi are within acceptable parameters per the Cleanroom design or client specifications

Viable / Microbial Surface Testing: Assures Bioburden levels for bacteria and/or fungi are within acceptable parameters per the Cleanroom design or client specifications

Airflow Visualization Profile: Verifies the hood is providing non-turbulent airflow to work area and that airflow is not escaping the front opening or sash seal at the workface opening

Temperature, Relative Humidity Measurements: Verifies the LFH is operating within its design specifications

Lighting Measurement: Verifies the lighting level is meeting the LFH design level or worker comfort level

Sound Level Measurement: Verifies the sound level is not exceeding the LFH design or worker comfort level



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