Environmental, Health and Safety Services

Fume Hood Certification

In order for a hood to be effective, it must be properly selected, installed, and utilized. Some variables that can impact the effectiveness of a hood are:

  • Sash opening height, ease of movement, and condition of glass,
  • Integrity of the cabinet (side panels in place, no modified openings added to walls, etc)
  • Amount of items (e.g., chemicals and equipment) stored within the hood,
  • Air velocity (i.e. "face velocity"), and
  • Hood location within the laboratory.

EHS conducts fume hood certifications, which include a general inspection, measurement of air/face velocity, and determination of proper sash positioning. These certifications occur on a routine annual basis and following maintenance involving the fan motor or other corrections after a previous failure or extended non-use period. Certification will be expressed as "pass" or "fail". A hood that has passed certification will be indicated by a "Hood Certification" sticker, which will note the testing date, person's initials, and average face velocity or smoke test results. The hood may be marked with adhesive arrows to indicate sash position, or testing height may be noted on the label. Many manufacturers have sash stops in place which also indicate recommended operating position.

A hood that has failed certification will be indicated by a bright orange (or other bright color) tag that states "CAUTION! - THIS HOOD IS OUT OF ORDER". It is very important that a hood bearing this tag not be used. The Laboratory Chemical Hygiene Officer (LCHO), Principal User, or other designated representative is responsible for contacting Facilities for necessary repairs.

If a hood has been tagged by EHS as having failed certification, or if it is apparently malfunctioning, the following steps should be taken:

  • Tightly cap or remove chemical containers.
  • Tightly cap containers when the problem is with the roof exhaust fan.
  • Remove containers when the problem is within the hood, or when the source of the problem is unknown.
  • Call Facilities at 231-4300 to report the problem / submit a work order.
  • Ensure that work is not conducted in the broken hood until repair and recertification have been successfully performed.

Please contact EHS for further guidance and information as needed. General tips can be found Here.