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Factors that Affect the Performance of a
Fume Hood
The following are common situations that can arise in
laboratories that may negatively affect fume hood performance:
Objects obstructing the return ducts and baffle areas.
Objects placed in close proximity to return ducts and
baffles tend to interfere with air being pulled from the back portion of
the fume hood. Place large equipment on stands to allow air flow
underneath, remove unnecessary chemicals and equipment, and place them
in a proper storage location.
Objects and equipment too close to the front of the fume
hood.
This has the potential to create unwanted air currents
that may allow contaminants to leave the front area of the fume hood and
cause unwanted exposures. All equipment and materials should be placed at
least 6 inches from the face of the fume hood. Use a length of tape to
mark out six inches.
Secondary currents created by portable fans and traffic in
front of the hood.
These currents draw contaminants out of the fume hood. Do
not direct any other ventilation (portable vans, HVAC ductwork) towards a
fume hood. Limit pedestrian traffic in front of the hood while in
use.
In general, make the following changes to the work
area to increase the capture of the fume hood and to achieve maximum
protection for the user:
Obtain fume hood education from DEHS.
Close all windows and doors.
Limit pedestrian traffic in front of the fume
hood.
Limit operator's body movement as
much as possible.
Lower sash to the operating level
indicated by certification sticker.
Redirect heating and air
conditioning vents away form fume hood. Contact DEHS for guidance.
Do not place your face inside a
fume hood. Keep hands as far out
as possible.
Use well controlled movements when
hands and arms are in the fume
hood. Avoid movements that may draw contaminants out of the
hood.
Questions, requests for more information or training
on proper use of fume hoods may be addressed to Ann Woodall or call
831-7026.
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