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A fume hood is a ventilated, enclosed workspace intended to capture, contain and exhaust harmful or dangerous chemical fumes, vapors and particulate matter generated by procedures conducted within the hood. No HEPA filtration of either the intake or exhaust air takes place. The air is exhausted outside the laboratory. This makes a fume hood most suitable for chemical use and other work where sterility is not a concern. Fume hoods should be utilized for hazardous drug or chemical preparation and use with waste anesthetic gases such as isoflurane.
A Laminar Flow Hood (LFH), is not a biological safety cabinet. These devices do not provide any protection to the worker. They are designed to provide a sterile environment to protect the product. Air potentially contaminated with infectious agents may be blown towards the worker. LFHs should only be used for work with non-infectious materials such as media preparation. They should never be used with potentially infectious materials, toxins, volatile chemicals, or materials that may cause hypersensitivity to the worker such as animal dander.
A Biological Safety Cabinet (BSC) is a valuable supplement to good sterile technique and a necessary containment device when working with potentially infectious materials. All BSCs use high efficiency particulate air (HEPA) filters to treat intake and exhaust air. These filtered cabinets are primarily designed to protect against exposure to particulates or aerosols. 70% of the air in most BSCs is recirculated back into the lab through its exhaust HEPA filter. This purifies the air of potentially infectious aerosols and animal dander or bedding but does not reduce exposure to chemicals or gases including waste anesthetic gases such as isoflurane.
| 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 | ||||
Factors that Affect the Performance of a Fume Hood
The following are common situations that can arise in laboratories that may negatively affect fume hood performance:
-Objects obstructing the return ducts and baffle areas.
Objects placed in close proximity to return ducts and baffles tend to interfere with air being pulled from the back portion of the fume hood. Place large equipment on stands to allow air flow underneath, remove unnecessary chemicals and equipment.
-Objects and equipment too close to the front of the fume hood.
This has the potential to create unwanted air currents that may allow contaminants to leave the front area of the fume hood and cause unwanted exposures. All equipment and materials should be placed at least 6 inches from the face of the fume hood. TIP: Use a length of tape to mark out six inches.
-Secondary currents created by portable fans and traffic in front of the hood.
These currents draw contaminants out of the fume hood. Do not direct any other ventilation (portable vans, HVAC ductwork) towards a fume hood. Limit pedestrian traffic in front of the hood while in use.
The following actions will improve fume hood efficiency and provide maximum protection for the user:
-Attend Labsafety training as necessary as possible.
-Close all windows and doors to the lab when working in a fume hood.
-Limit pedestrian traffic in front of the fume hood.
-Limit operator's body movement as much as possible.
-Lower sash to the operating level indicated by certification sticker.
-Do not place your head inside a fume hood.
-Use well controlled movements when hands and arms are in the fume hood. -Avoid movements that may draw contaminants out of the hood.
• 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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