Benefits Of Laboratory Fume Hoods

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Benefits Of Laboratory Fume Hoods
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To shield workers from toxic fumes and to protect
the specimen, labs are outfitted with laboratory
fume hoods. This is mandatory lab safe equipment
should be installed in labs that deal with
chemical and toxic research and similar
applications because this is used everyday.
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To keep toxic fumes out of the lab's working area
and to protect the worker and specimen from these
fumes, laboratory fume hoods are installed. These
are partially enclosed work spaces that are
ventilated and do the job of exhausting fumes
outside of the lab area.
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It takes up a small space in a lab but has large
usable interior working depth to allow the enough
space to do experiments. The tempered safety
glass positioned at the back, and sides and tall
viewing window give superior visibility for
demonstrating chemical experiments or to observe
how students or workers conduct the experiment.
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The unit has a hood of course and a sash that can
be raised for easy loading and cleaning, and
opened or closed to maximize or minimize access
to airflow. For the analysis of trace metals and
corrosive substances, especially thermoplastic
designed laboratory fume hoods that resist
corrosion are recommended for installation.
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The fume hood's efficiency is measured by speed
of the air flow that crosses between the work
surface and the sash. This is measured in feet by
the minute and the greater the velocity of the
hood face, the faster toxins and vapors are
flushed out.
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There is a recommended hood face velocity for the
amount air necessary to achieve laminar flow
velocity and that is 100 feet per minute.
Generally laboratory fume hoods prevent exposure
to vapors and toxins and there are different
hoods designed to work in different velocities
for various chemical and technological
applications.
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There are two types of hoods - radioisotope hood
systems and perchloric acid systems. The first
type is fashioned from stainless steel that
prevents the absorption of radioactive elements.
Perchloric acid hoods prevent the build up of
volatile perchlorate salts along the exhaust
systems.
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There are five standard construction types
available to meet conventional, bypass, variable
air volume, bypass, auxiliary, and ductless
requirements. The conventional type facilitates a
constant volume of exhausted air without regards
to sash heights.
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Bypass hood incorporates design that gives
additional room air even when the sash is down or
closed. The variable air volume hoods are
technically sophisticated to keep air velocity
constant whatever the sash height.
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If energy savings is a factor, the auxiliary
laboratory fume hood that supply outside air via
the bypass hood thereby reducing the volume of
exhausted air-conditioned or heated room air.
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This contains extra controls to adjust face
velocity of air to match different sash
positions. The ductless laboratory fume hoods are
capable of re-circulating air back to the lab
after filtration systems work.
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Excellent laboratory fume hoods have high
filtration performance. These should have
replacement parts and technical support for
installation and maintenance, and must be
regularly monitored for efficiency.
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