Chengdu Ample Import And Export Co., Ltd. |
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1. Product Description
A fume hood (sometimes called a fume cupboard or fume closet) is a
type of local ventilation device that is designed to limit exposure
to hazardous or toxic fumes, vapors or dusts.
A fume hood is typically a large piece of equipment enclosing five
sides of a work area, the bottom of which is most commonly located
at a standing work height.
Type of Fume Hoood
Student workstations
Student workstations are generally deployed in undergraduate
teaching lab
settings and are used by students while under supervision by
instructor. Accordingly, materials of construction are adjusted to
suit less demanding chemical resistance needs. Glass side and back
windows are often provided. Often these hoods are placed on an
island and are manufactured in a back-toback configuration with two
working chambers.
Acid Digestion Hoods
- For operations involving heating and evaporation of acids,
special materials are used in the construction of the hood
interior. The principle changes include a PVC or polypropylene
liner, polytetrafluoroethylene (PTFE) coated sash frame, lower
airfoil and exhaust connection. In addition, if the hood will be
used with hydroflouric acid, then the sash glass and light lens is
changed from glass to polycarbonate.
Perchloric Acid Hoods
For operations involving heating and evaporation of perchloric
acid, special fume hoods are produced. These hoods are always bench top models
with the addition of a wash-down system and drain trough to remove
hazardous perchlorate residues from the hood interior. Perchloric acid hoods
are always connected to a dedicated exhaust system which is also
equipped with a water wash system. Perchloric acid hoods can be equipped with a stainless
steel liner if they will be used with perchloric acid only or a PVC
liner if they will be used with other acids as well.
2. Product Parameters
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 ℃ | |||||
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 |
3. More About the Fume Hood
A laboratory chemical fume hood is first and foremost a safety device. Users need to be able to rely on their fume hood as a primary containment device to protect them from the hazards within. It is connected to a remote exhaust system and provides operator protection by drawing air around the operator and into the hood chamber through the working opening.
When the sash is closed, the exhaust system continues to operate to maintain the working chamber and exhaust ducting at negative pressure and provide containment of fumes and vapors. Fume hoods are generally served by either constant air volume (CAV) or variable air volume (VAV) exhaust systems.
A typical bypass fume hood can be used on a constant volume system. This is due to an alternate path being created to allow air to enter the fume hood when the sash is closed. Automatic compensating bypass hoods can be manufactured with vertically rising sashes only. Certain types of fume hoods can't be made in an automatic compensating bypass configuration. Such cases include fume hoods that include horizontally sliding panels as well as double hung vertically rising sashes. While the velocity increase is more noticeable as the sash is closed, such hoods can be used successfully with a CAV exhaust system.
Some of the most common models of chemical fume hoods offered by
manufacturers include benchtop models. Others include thin-walled
benchtop models, and walk-in fume hood models. You should also
ensure that the manufacturer or supplier you have chosen is a
certified and reliable one, supplying only high-quality products.
Specials attributes like chemical and flame resistance should also
be available for the fume hoods. A chemical fume hood is a
long-term investment. Thus, like any other laboratory furniture,
one should always ensure that they make a well-informed decision.
This is done by knowing all the facts in advance.
4. Detailed Photos
5. Fume Hood Maintenance
• Hoods should be evaluated by the user before each use to ensure adequate face velocities and the absence of excessive turbulence.
• In case of exhaust system failure while using a hood, shut off
all services and accessories and lower the sash completely. Leave
the area immediately.
• Fume hoods should be certified, at least annually, to ensure they
are operating safely. Typical tests include face velocity
measurements, smoke tests and tracer gas containment. Tracer gas
containment tests are especially crucial, as studies have shown
that face velocity is not a good predictor of fume hood leakage.
• Laboratory fume hoods are one of the most important used and
abused hazard control devices. We should understand that the
combined use of safety glasses, protective gloves, laboratory
smocks, good safety practices, and laboratory fume hoods are very important elements in protecting us from a potentially hazardous
exposure.
• Laboratory fume hoods only protect users when they are used
properly and are working correctly. A fume hood is designed to
protect the user and room occupants from exposure to vapors,
aerosols, toxic materials, odorous, and other harmful substances. A
secondary purpose is to serve as a protective shield when working
with potentially explosive or highly reactive materials. This is
accomplished by lowering the hood sash.
6. Project Cases
7. FAQ
6 Questions to Ask When Buying a Fume Hood:
-Which chemicals will you use within the hood?
-Is a ducted or ductless hood best suited to your needs and
available space?
-Where will you place the fume hood in the lab? Consider workflows,
access to external exhaust systems, and competing air patterns.
-What size fume hood will best suit your needs? Be sure to consider
what (if any) equipment will be enclosed in the hood.
-Are any service fixtures or accessories such as airflow monitors,
electrical outlets, water, or gas fixtures required?
-Are base cabinets for acid, solvent, or non-chemical storage
required?