Chengdu Ample Import And Export Co., Ltd. |
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A ductless fume hood is a stand alone, compact workstation that
provides a continuous flow of air that filters hazardous fume
vapors out, recirculating clean air back into your working
environment. Because the air is recirculated, no exterior ducting
or makeup air is necessary. These air filtration systems are
designed to keep harmful airborne contaminants away from the
operator's respiratory zone while they work within the hood.
Also referred to as exhaust hoods, these containment systems are
used for a variety of applications including chemical fume control,
powder and dust removal, solvent vapor control, pharmaceutical
powder filling, light grinding, acid gas fumes, anesthesia gas
containment, epoxy fume control and other applications that produce
hazardous particulates and fumes.
Ductless fume hoods offer several key advantages when weighing your
options versus a ducted fume hood:
-No costly ducting or venting
-No permitting issues for venting outside of the building
-Adaptable (mobility and ease in change of layout)
-Environmentally friendly
-Significant energy cost saving
Model Parameters | YT-1500A | YT-1500B | YT-1500C | YT-1800A | YT-1800B | YT-1800C |
Size (mm) | 1500(W)*865(D)*2400(H) | 1800(W)*1205(D)*2400(H) | ||||
Worktop Size (mm) | 1260(W1)*795(D1)*1100(H1) | 1560(W1)*795(D1)*1100(H1) | ||||
Worktop | 20+6mm Ceramic | 20+6mm Ceramic | 12.7mm Solid Physiochemical Board | 20+6mm Ceramic | 20+6mm Ceramic | 12.7mm Solid Physiochemical Board |
Liner | 5mm Ceramic Fibre | 5mm Compact Laminate | 5mm Compact Laminate | 5mm Ceramic Fibre | 5mm Compact Laminate | 5mm Compact Laminate |
Diversion Structure | Back Absorption | |||||
Control System | Touch-Tone Control Panel (LED Screen) | |||||
Input Power | 220V/32A | |||||
Fan Power | Less than 2.8 A | |||||
Socket Max. Load | 5KW | |||||
Faucet | 1 Set | |||||
Drainage Mode | Natural Fall | |||||
Storage | Double-Lock, Corrosion-Resistant, Damp-proof, Multi-layer Solid Wood with Mobile Wheel | |||||
Application | Indoor No-blast, 0-40 ºC | |||||
Application Field | Organic Chemical Experiment | |||||
Face Velocity Control | Manual Control | |||||
Average Face Velocity | 0.3-0.5 m/s Exhaust: 720-1200m³/h | 0.3-0.5 m/s Exhaust:900- 1490m³/h | ||||
Face Velocity Deviation | Less than 10% | |||||
Average Illumination | Less than 500 Lux | |||||
Noise | Within 55 dB | |||||
Exhaust Air | No Residue | |||||
Safety Test | In Accord with International Standard | |||||
Resistance | Less than 70Pa | |||||
Add Air Function | Distinctive Structure (Need Exclusive Add Air System) | |||||
Air Flow Control Valve | Dia. 250mm Flange Type Anti-Corrosion Control Valve | Dia. 315mm Flange Type Anti-Corrosion Control Valve |
Recirculating fume cupboards do not require external
fans/ductwork/exhaust ducts or make-up air systems since they
filter and recycle the laboratory air. They don't exhaust chemical
pollutants into the atmosphere and they are mobile, so can be moved
to suit changing laboratory environments. Fume hoods that are built
with filters instead of ducting are immediately available for use
without lengthy or costly installation requirements. They can be
temporarily stored and dispatched where needed by a safety officer
for a scheduled class or project and also be placed anywhere at a
moment's notice to protect users in cases in which the need
suddenly arises.
The frame of use of a ductless filtering fume enclosure is limited
to certain chemicals. This limitation can vary between
manufacturers, which is why it is important to consult each
manufacturer's guide of retained chemicals or chemical listing to
determine the TWA (time-weighted average over an 8 hour period)
maximum exposure rates. Filters are only able to remove chemicals
down to a set ppm and some chemicals can be as low as 2ppm TWA!.
Another disadvantage can be the amount of chemicals being used -
especially if boiling off large quantities of acids where a lot of
moisture is generated as fume cupboard filters have a finite
adsorption capacity. It is recommended to monitor filter saturation
in any situation (for example a built-in filter alarm). It is
necessary as well to periodically replace the filters (recommended
annually or 600 hours use, whichever occurs sooner).
What Is a Fume Hood?
A fume hood is a piece of laboratory equipment designed to minimize
a person's exposure to hazardous chemicals. The fume hood draws
away harmful vapors so lab employees can work with chemicals
without the risk of accidental exposure. The air is extracted from
the fume hood and filtered to remove dangerous vapors, and then
either exhausted outside of the building or recirculated back into
the lab.
How Does a Fume Hood Work?
The fume hood works by using a sash (a window that opens or closes
to protect the user) to contain the vapor and keep it away from the
user's face or to prevent it from drifting out into the rest of the
laboratory. Blowers draw in air from the room, through a filter or
number of filters within the fume hood and towards an exhaust area.
To safely work in a fume hood, keep all work at least six inches
away from the plane of the sash. This will ensure fumes are pulled
away from the user. Also, make sure the hood sash remains closed as
much as possible and keep the hood slots and baffles free of any
obstructions by containers or equipment. Never place your head
inside the fume hood when working with chemicals.
The airflow will differ depending on the type of hood you use. For
a constant air volume (CAV) hood, the fan has only one speed,
providing a stable and continuous airflow. A variable air volume
(VAV) hood allows users to adjust the velocity of the exhaust for
added versatility, while reduced air volume (RAV) hoods offer lower
airflow performance, making them ideal for working with less
harmful compounds.