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ductless fume hood
VENTILATION & FUME HOODS
Ventilation controls are those controls intended to minimize employee
exposure to hazardous chemicals by removing air contaminants from
the work site. There are three main types of ventilation controls:
1. General (Dilution) Exhaust - a room or building-wide system
which brings in air from outside and ventilates within. Laboratory
air must be continually replaced, preventing the increase of air
concentration of toxic substances during the work day. General
exhaust systems are not recommended for the use of most hazardous
chemicals.
2. Local Exhaust - a ventilated, enclosed work space intended
to capture, contain and exhaust harmful or dangerous fumes, vapors
and particulate matter generated by procedures conducted with
hazardous chemicals.
3. Ductless, or Portable Fume Hoods ? an enclosed work space which
employs filtration media, may be an option to conventional local
exhaust hoods.
To determine ventilation requirements, assess the MSDS. Some MSDS
terminology, as listed below, may indicate a need for special
ventilation considerations beyond general exhaust:
o use with adequate ventilation
o avoid vapor inhalation
o use in a fume hood
o provide local exhaust ventilation
Local exhaust ventilation is the one of the best engineering methods
available to reduce the health hazard risk associated with the
use of hazardous chemicals in the laboratory. Laboratory fume
hoods are the most common local exhaust ventilation devices found
in the laboratory. Fume hoods are used to prevent hazardous, offensive,
or flammable gases and vapors from mixing with the general room
air. A hood, especially with the sash down, acts as a physical
barrier between the laboratory workers and chemical reactions.
The hood can also contain accidental spills of chemicals
 Please Contact Us to discuss your ductless fume hood
needs. You design it, we build it.
ductless
fume hood
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