 |
      |
Manufacturers
of the Air-Sentry Fume Hood
 |
 |
|
|
 A
Laboratory Fume Hood is a ventilated enclosure
designed to contain and exhaust fumes, vapors,
mists and particulate matter generated within
the hood interior. Fume hood structures are basically
boxlike, with an open side (or sides) for access
to the interior of the hood. A transparent, movable
panel, called a sash, allows the user to restrict
or enlarge the hood opening. The hood is connected,
via ductwork, to an exhaust fan, usually located
on the roof of the building in which the hood
is located. The exhaust fan draws air from the
room in which the hood is in through the hood
opening and out through the ductwork. The speed
of the air moving through the hood opening is
known as face velocity.
|
Above all else, laboratory
fume hoods are SAFETY DEVICES, designed to contain
contaminants generated inside the fume hood’s
chamber. Selection of the proper fume hood design
and safe work practices are key to user safety.
Laboratory fume hoods are also referred
to as:
• Fume Hoods
• Chemical Fume Hoods
• Fume Cupboards
• Exhaust Hoods
• Hoods
The following is the definition of a Laboratory
Fume Hood from the Scientific Equipment and Furniture
Association (SEFA):
"A Laboratory Fume
Hood is a ventilated enclosure that, when connected
to a properly designed laboratory ventilation system,
will carry the undesirable effluents (generated
within the enclosure during a laboratory procedure)
away from laboratory personnel. A Laboratory Fume
Hood shall be made primarily from the flame resistant
materials including the top, three fixed sides,
and a face opening. The face opening is equipped
with a sash and sometimes an additional protective
shield. The face opening will have a profiled entry
and usually an airfoil designed to sweep and reduce
reverse airflows on the lower surface. A Laboratory
Fume Hood will be equipped with a baffle and, in
most cases, bypass systems designed to control airflow
patterns within the enclosure and manage the even
distribution of air at the opening. The bypass system
may be partially blocked to accommodate Variable
Air Volume (VAV) Systems. A Laboratory Fume Hood
will be set on a bench, a pedestal, or on the laboratory
floor. Generally, Laboratory Fume Hoods, as long
as twenty feet, reflect the basic tenant of a Laboratory
Fume Hood." (Scientific Equipment and Furniture
Association, SEFA 1-2002 Recommended Practices for
Laboratory Fume Hoods. 2002.) |
|
|
| |
|
|
|
