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#500d airflow full#

EH&S will notify the researchers and post a “Do Not Use” sign if repair is required. If a hood fails an inspection, it may need to be taken out of service until repaired. The following definitions are used by EH&S to track the operational status of fume hoods. EH&S may also note any observed problem with controls, sash, baffles, plumbing, light or corrosion.įume hoods tested by EH&S will have a label that records its inspection history: The performance test typically includes an evaluation of the face velocity, the sound, containment, monitor performance and the tracking ability of a VAV (when applicable). Fume hood testing and inspectionĮH&S performs a functional performance test to assure hoods perform as required about every 18 months. The fume hood must be operated with the sash no higher than the red arrow.ĭetailed instructions for use of the fume hood can be found in the Lab Safety Manual. The fume hood can provide adequate protection for most laboratory processes if it is used correctly.

#500d airflow full#

(Note that some legacy hoods were designed to operate at 100 LFM at full sash height, as high as 25 inches). Low flow fume hoods are designed to operate at 70 LFM at 18 inches sash height. Standard flow fume hoods are designed to operate at 100 linear feet per minute (LFM) at 18 inches sash height. The hoods will display a label that identifies what type of ventilation control is employed:įume hoods are categorized into one of two groups: 1) standard flow, and 2) low flow. A number of older wood fume hoods and fume “cupboards” are still maintained.

Fume hood controls include constant air volume (CAV), variable air volume (VAV) and two-state (two speed) control. Types of fume hoods at the University include chemical, radioisotope and perchloric acid hoods, with various airflow controls.

American Industrial Hygiene Association Workplace Environmental Exposure Limits (AIHA WEELs).

American Conference of Governmental Industrial Hygienists threshold limit values (ACGIH TLVs®).

National Institute for Occupational Safety and Health Recommended Exposure Limits (NIOSH RELs).

Occupational Safety and Health Administration Permissible Exposure Limits (OSHA PELs).

Standards for determining permissible exposure limits include: Fume hoods, or other effective local ventilation, must be provided and used when the materials used will exceed exposure limits in the laboratory.

Fume hoods should be used when working with toxic compounds or compounds with a boiling point below 120☌.

A fume hood is a ventilated enclosure that usually vents separately from the building’s heating, ventilation and air conditioning (HVAC) system and not recirculated into the building. Fume hoods are a primary method of exposure control in the laboratory.