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Environmental Health & Safety

CHEMICAL FUME HOOD PERFORMANCE STANDARD

Classical Chemical Fume Hoods Used for Chemical or Radiological Use

  • Constant volume chemical fume hoods provide an intake face velocity of approximately 100 linear feet per minute (fpm) across an imaginary vertical plane when the hood's sash opening is approximately 2/3 open.
  • Variable air volume (VAV) chemical fume hoods provide an intake face velocity of approximately 100 linear fpm across an imaginary vertical plane regardless of the hood's sash opening.

High-Performance (Low-Flow) Chemical Fume Hoods for Chemical or Radiological Use

  • High-performance chemical fume hoods, also known as low-flow chemical fume hoods, operate with a lower intake face velocity. The UofR utilizes the National Institutes of Health (NIH) requirements that these hoods operate at a minimum of 80 linear fpm.

Intake Face Velocity Checks

  • Environmental Health & Safety's Laboratory Safety Unit performs acceptance testing of all newly installed chemical fume hoods to ensure they have the correct intake face velocities. A sticker is placed on the fume hood to indicate maximum height of the sash.
  • Two different stickers are used based on the type of fume hood. Both the constant discharge and the VAV fume hoods utilize a green sticker and high-performance (low-flow) hoods utilize an orange sticker.
  • All chemical fume hoods are to be checked annually.
  • Height of Opening
    • The height of the opening is measured from the hood deck for those hoods having deck level air foils.
    • During use, the bottom of the sash should be placed even with the arrow on the Air Flow Sticker or lower.
    Contacts
    • Chemical fume hoods (used for chemicals) are checked by the Laboratory Safety Unit (extension x5-3241). The date of the test and the result is placed on a sticker (sample shown to the left).
    • Chemical fume hoods (used for radioisotope as well as chemicals) are checked annually by Environmental Health & Safety's Radiation Safety Unit (extension x5-3781). The date of the test and the result is placed on a sticker similar to the one shown to the left.
    • If there is a problem with a fume hood, please contact Facilities at ext. 3-4567 IMMEDIATELY

    Photos of hoods showing proper sash openings for use can be seen in the pdf version of this standard - PDF version.




    QUESTIONS or COMMENTS?
    Contact EH&S at (585) 275-3241 or e-mail EH&S Questions.

    This page last updated 12/7/2015. Disclaimer.