Skip to main content
Sign In

University of Colorado Denver

Environmental Health and Safety, University of Colorado Denver

Laboratory Hoods

Laminar Flow Hoods (LFH)/ Clean Benches

Laminar Flow Hoods

Laminar Flow Hoods or Clean Benches employ the use of HEPA filters to remove potentially harmful particulates from intake airflow before it is passed over the work area (product) towards the user. This horizontal laminar airflow is an example of positive pressure or pressure in a space causing an outflow of air (see figure 3). Clean Benches can also use vertical laminar airflow downward to provide marginal personal protection. However, clean benches DO NOT offer adequate protection from infectious agents or hazardous chemical vapors.


  • Provide product protection only.
  • Product protection is provided by HEPA filtered particulate free unidirectional airflow.
  • Discharged air is exhausted directly at operator and into work area.

Material Applications:

  • Any application where the product is not hazardous but must be kept contaminant free.
  • Preparation of non-hazardous intravenous mixtures and media.
  • Particulate free assembly of sterile equipment and electronic devices.

Materials NOT to be used:

  • Any product that presents a biological or chemical hazard! If you have questions regarding the hazard level of your product or other materials you will be using in the clean bench, call EH&S (4-0345) for assistance.

If you have a Laminar Flow Hood or Clean Bench in your lab it is your responsibility to have it serviced regularly. Changing the HEPA filters and monitoring its airflow is necessary to ensure proper science. EH&S will NOT service or check them for you.

© The Regents of the University of Colorado, a body corporate. All rights reserved.

Accredited by the Higher Learning Commission. All trademarks are registered property of the University. Used by permission only.