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The fume hood is an important safety staple in chemistry classrooms and research labs. Getting the most out of a fume hood begins with selecting the right one for your application. That means knowing precisely what type of work will be performed in the fume hood and making the choice between constant air volume and variable air volume, choosing between a ducted and a ductless fume hood, and selecting the appropriate material of construction.
Type of Fume Hoood
-General Purpose Bench Top
The most common type of fume hood utilized in most types of labs. The liner
selected is generally fiberglass reinforced polyester (FRP) which has a broad application.
-General Purpose Floor Mount
Floor mounted hoods are used where the dimensions of the apparatus exceed what can be accommodated in a bench mounted fume hood or where the weight involved precludes placing the apparatus on a bench top.
High Performance Hoods-
High performance hoods allow greatly reduced face velocities at full working height, resulting in a 40-50% reduction in energy use as compared to a general purpose hood. These are generally restricted to common bench top general
purpose applications, suitable for VAV or CAV use.
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.
Radioisotope Hoods
Radioisotope hoods are designed for use with radioactive materials and have a smooth coved stainless steel liner with an integral dished work surface. The work surface is reinforced to support the weight of heavy shielding which may need to be utilized by the user.
| 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 | ||||
HOOD SET-UP AND USE
• When using the fume hood, keep your face outside of the hood
• Always wear splash goggles, and use a full face shield if there is possibility of an explosion or eruption. Wear gloves appropriate for the materials being used.
• Do not make quick motions into or out of the hood, use fans, or walk quickly by the hood opening. All will cause airflow disturbances which reduce the effectiveness of the hood.
• Keep the lab windows closed. Drafts from open windows and doors can significantly affect the hood's performance.
• Keep the hood sash closed, except when working within the hood.
• In case of exhaust system failure while using a hood, shut off all services and accessories and lower the sash completely. There should still be some minimal inflow of room air up the ductwork from a chimney effect, which will assist in keeping contaminants in the hood even if the hood fan goes out. Discontinue all work and leave the room until power and exhaust is restored.
GOOD HOUSEKEEPING PRACTICES
• Do not use fume hoods for equipment storage. Excessive storage of materials or equipment can cause eddy currents or reverse flow, resulting in contaminants escaping from the hood.
• Do not use fume hoods for chemical storage. Keep the smallest amount of chemicals in the hood needed to conduct the procedure at hand. Store hazardous chemicals such as flammable liquids in an approved safety cabinet.
Never use the hood to evaporate excess chemical waste. All chemical containers must be capped when not in use.
• Keep the hood clean. Remove unneeded experimental glassware and clutter. Wipe-up any spilled chemicals or residues.
Probably the most important consideration is the type of chemicals that your laboratory uses. The majority of ductless fume cabinets are only suitable for process-specific or light-duty fumes. Before you decide if this unit is right for you, compile a list of all the chemicals and the quantities of each. From this, you should be able to determine if a ductless hood would work in your lab. If your laboratory use is likely to change over time, or you do not know what type of chemicals will be used in future, then this fume extraction system might not be the best choice for you. The safety and health of your employees or operators should be your top priority, so the type of chemicals you are using will be the main deciding factor on whether a ductless fume hood is right for you.
Another critical factor to consider is the cost of a recirculating fume hood. We have already mentioned that this system can often be more cost-effective than a ducted alternative. A ducted system needs to have an expensive infrastructure around it, such as ducting, mechanical systems, exhaust fans, roof elements and more. All of these things are an additional cost to consider. A filtered hood eliminates all of these extra costs, but that does not mean they are free to run. Ductless hoods will need regular filter replacements, which is an expenditure that needs to be taken into account
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