A traditional laboratory fume hoods have
a box with a movable sash window-like structure. To ensure full protection, the fume hoods
should be properly sited. Due to pedestrian flow, doors and supply air
diffusers locate hoods to prevent crosscurrents at the hood nose. Sufficient
laboratory supply air must be available to allow hoods to work at their required
face velocities. The hood works by maintaining a fairly negative pressure
within the hood to prevent any contaminant from escaping while at a constant
pace drawing air through the hood opening. A suitable hood face velocity is of
interest for the safe and efficient function of a laboratory
fume hood. While excessive face velocities can
often lead to friction and reduced containment, the hood's efficiency can also
be compromised by insufficient speeds. Overall, the face velocity of a hood is
recommended to vary between 0.3 m / s (60 fpm) and 0.5 m / s (100 fpm), but it
is necessary to test the face velocity recommendation with local safety
legislation before using the fume hoods. Most hoods are usually designed for a
minimum face velocity at full sash opening; but as a means to save energy, some
hoods design the hood's minimum face velocity at the half-sash opening,
producing new low-flow laboratory fume hoods, which are now on
market.
Although there is various type of Laboratory fume
hoods, 5 of them are renowned among the
user due to their different properties. Let’s have a look upon the same:
Bench-top Fume Hood
- A fume hood at the bench-top is normally mounted on a bench-top or
above a storage cabinet. Bench-top hoods are used for a wide variety of
chemical procedures that require small to moderate quantities of low to high
toxic materials. Benchtop
Fume Hoods have efficient containment and emissions of low particulate
mass gases, vapor, mists, fumes, and other aerosols.
Distillation Fume Hood- A distillation hood is defined by a low height of the work desk, which
results in the operator having a wide working height. It allows for the
installation and positioning of large distillation equipment in the workroom.
Otherwise, it has features similar to those of a regular fume hood. The hood is
unable to withstand fires since the sash is fully sealed. If there is an
explosion hazard, the user should have adequate strength to deflect or contain
the anchored barriers, shields or enclosures.
Perchloric Acid Fume Hood- The perchloric acid reacts with organic materials violently. The
perchloric fume hoods also require built-in water wash-down systems to prevent
salt deposits from being perchlorinated. Both treatments use perchloric acid
must be limited to a perchloric fume hood to avoid adverse interactions with
certain chemical substances. Perchloric acid should not be used with a
traditional fume hood. Perchloric acid vapours may settle to ductwork,
resulting in perchlorate crystals being deposited.
To Radioisotope Fume Hood- Radioisotope fume hoods are designed primarily to protect users from
hazardous materials. We have specially designed workstations to withstand the
weight of lead shielding tiles, and may also have lead-laced sashes. For
decontamination purposes, the interiors are made of stainless steel with
polished corners.
Floor Mounted Fume Hood- For applications involving large Lab equipment,
floor-mounted fume hoods are used. These hoods, as the name implies, are
mounted on the floor, without any work surface. It allows the movement of
materials and machinery into and out of the hood. Mounted floor hoods are often
referred to as walk-in fume hoods, although incorrectly.
This Information is regarding laboratory Fume
mostly usually used 5 type hoods and their variety like, how reliable and safe
it is, how it protects user-health from various harmful gases it will be easy
for the user to choose which one suit best for their needs and important facts
to ensure its full protection. So, the user won’t be afraid of trying these 5
Laboratory Fume Hoods. Now that everybody will be easily similar about types of
Laboratory fume hood and its properties, which will be very useful to attract
the several user/customer, and it will automatically improve the trade as well.
We have everything that anyone requires to make a
lasting impression on the users who are associated with a laboratory fume hood.
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