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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 | ||||
Adequate planning and preparation are important when using a fume Hood. Knowing the standard operating procedure is also needed in order to maintain the equipments throughout.
Ensure that the exhaust is in good working condition before begining experiment. The baffles should be examined to check for obstructions. Airflow monitor should be checked to see if it is at the correct level,in a hood that has it.
Limit chemical exposure by keeping your face outside the plane.
Gears that will protect you where there is spills or fire is required. Such protective gears are gloves, splash googles and lab coat.
When the hood is not in use, keep it closed.
The sash should be closed to save energy.
When there is a suspicion of malfunction, or when the alarm for airflow goes off, terminate operations.
Don't suddenly remove it place items in the hood. This causes air disturbance, and the effectiveness of the equipment is reduced.
Instructions from the fume manufacturer should've read carefully. This prevents making mistakes
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
Why do fume hoods use so much energy?
It's the air being sucked through the fume hood, not the fume hood itself that consumes so much energy. For health and safety reasons, labs use 100% outside air which must be heated or cooled for comfort before it is brought into the lab. In addition to the energy required to condition the air, a significant amount of additional electricity is required to run large fans to move the air through the building and through the fume hoods.
How does shutting the sash save energy?
Most fume hoods at Stanford are variable air volume (VAV), meaning that the fume hoods are designed to vary the air flow based on how wide open the sash height is. Sash position is connected to the building's ventilation system so that a building's fan speed and the volume of air moved is reduced when the sash is lowered.
Is it safe to shut the sash?
The sash is an important safety barrier between the fume hood interior and the laboratory, protecting the lab user. Sashes should be opened only to set up or modify an experiment. At all other times, shutting the sash is safest. When the sash is shut there is still some air flow through the hood to remove any fumes.
How do I remind myself and my roommates to close the sash?
You can post a sticker, like the one shown in the picture below, to remind yourself and your lab mates to close the sash when not in use. The sticker also educates new fume hood users tha a lower sash is safer, and that the sash should only be open when setting up and modifying experiments.
What other fume hood practices can reduce my energy consumption?
• Never use a fume hood just for storing chemicals - they belong in a safety cabinet, which doesn't require huge volumes of air.
• If your fume hood has an occupancy switch, turn it off when not in use.
• If your group is no longer using a specific fume hood, consider having it locked and de-commissioned so air no longer flows through it.
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