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The most common fume hoods are bypass hoods. These are designed to operate at a constant volume of air. There are numerous kinds of bypass fume hoods including auxiliary air, high performance, and reduced air volume hoods. The fume hoods have an efficient air exhaust system that allows expulsion of toxic gases.
Some fume hoods are specially made to handle specific corrosive substances such as hyperchloric acid. Others have specifications that enable handling of radioactive materials and are fitted with filters to prevent the release of these elements to the environment.
A laboratory fume hood is widely found in many analytical chemistry labs where experiments that release toxic gases such as sulfur dioxide gas are released.
It is also ideal for performing experiments that involve chemicals that easily sputter out during heating. Such compounds can easily burn the lab technician and other lab occupants when conducted in the open space.
The other kind of experiments that should be conducted inside a laboratory fume hood are ones that involve flammable chemicals. These chemicals can be deadly when exposed to the air.
Aerosols, carcinogens, and other volatile chemicals are also handled within this enclosure.
| 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 | ||||
A laboratory is a building where experiments are conducted. There are many kinds of laboratories, and each type is used for performing a particular type of tests. The two major types are the chemistry lab and biology labs. These chemistry labs involve experiments that use toxic substances and thus care should be taken during the performance to prevent accidents. In a biology lab, most tests aren't as toxic as in chemistry labs. However, care should also be taken to avoid wastefulness and ensure that the safety of the user is assured.
A laboratory fume hood is an enclosure that is built inside a chemistry lab for conducting experiments that release toxic chemicals. A fume hood is also used to store volatile compounds that can be harmful to the environment. A laminar flow hood, on the other hand, is also an enclosure built mostly in a biological lab for conducting of experiments that involve delicate microorganisms. It is used to create a sterile environment for doing biological experiments. It is also called a biosafety cabinet.
Do not use your fume hood as a storage cabinet. From labs I have seen, this is the biggest offender. Doing so can lead to accidental spills of a large concentration of chemicals. When chemicals are not in use, be sure to store them in cabinets appropriate for the chemical.
There are solvent storage cabinets for flammable chemical storage that are manufactured to protect the internal contents in the event of a fire. Acid storage cabinets have a corrosion-resistant lining to protect the structure, and easy access to vent the cabinet into the fume hood to keep chemical concentrations low.
• 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.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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