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Fume hoods should provide a safe and functional workstation for laboratory workers, and are often purchased with vented, flammable, or corrosive storage base cabinetry. Flammable (flash point < 100 °F) and combustible chemicals (flash point >100 °F) impose a fire hazard when stored/used improperly. The most common fume hood safety hazards that arise in laboratories stem from cluttered workstations, improper chemical storage, chemical fume hood incompatibility, and failure to check the hood flow indicator to make sure that it is working properly before starting work.
When choosing a ducted or ductless system, it is important to get all of the necessary components to maintain good lab practices. Cabinets are available for regular, solvent (flammable and combustible), and corrosive (acids or bases) storage. Some cabinets are designed without a bottom for easy access to equipment that can be rolled into and out of the cabinet. If storage is not necessary, simple base stands or carts (for portable hoods) are available to elevate and support the hood and work surface.
Work surfaces vary in composition, abrasion, chemical, and heat resistance. Solid epoxy resin work surfaces provide the highest-level resistance, allowing users to perform tasks with high concentrations of solvents, acids, and bases. Solid phenolic resin stations are intended for high chemical resistance, but are not as hard and durable as epoxy stations. Stations made of composite resin provide the least amount of chemical resistance and are intended for general use only. Stainless steel work surfaces are also available for perchloric acid and radioisotope fume hoods, both of which require ducted exhaust.
All work surfaces can be purchased with or without spill containment for extra protection, and with cutouts for cup or trough sinks. However, the more plumbing that a hood requires, the less feasible portability becomes. Sinks would likely be plumbed to acid waste systems, and if gas, compressed air, N2, or vacuum turrets are necessary, then disconnecting and reconnecting the unit to move it becomes more of a bother.
| 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 fume hood is used for exhausting hazardous chemicals during research and experimentation. Ducted fume hoods connect to existing ductwork and release the unwanted, diluted gases outside of the laboratory area. Ductless fume hoods are filtered and recirculate the previously-polluted air after pulling toxins out. This process provides safety to those in the immediate area.
Walk-in fume hoods, also known as floor mounted fume hoods, are not to be used for chemical storage, regardless of their larger size. When chemicals are stored in fume hoods, there are a plethora of issues that can occur, including spills and explosions.
Contrary to their name, these fume hoods are not safe to be entered at all and should only be used in a manner that keeps the user protected by remaining on the outside of the fume hood.
Types of Chemical Storage Cabinets
-Acid & corrosive cabinets: This heavy-duty container is essential in preventing fires, leaks, and exposure to dangerous fumes that can wreak havoc on organic tissues. Made of strong polyethylene, these cabinets should be placed under a fume hood, as acids and corrosive materials can emit toxic fumes.
-Flammable cabinets: Designed to prevent and extinguish fire, flammable cabinets should house any liquid materials prone to combustion, like acetone or petroleum. These storage containers can be placed under a fume hood, but most importantly, they must not block exits or be improperly sealed.
-Biosafety cabinets: Biosafety cabinets house potentially harmful biological samples while providing separation and protection to the user, environment, and surrounding product
What Is a Fume Hood?
A fume hood is a piece of laboratory equipment designed to minimize a person's exposure to hazardous chemicals. The fume hood draws away harmful vapors so lab employees can work with chemicals without the risk of accidental exposure. The air is extracted from the fume hood and filtered to remove dangerous vapors, and then either exhausted outside of the building or recirculated back into the lab.
How Does a Fume Hood Work?
The fume hood works by using a sash (a window that opens or closes to protect the user) to contain the vapor and keep it away from the user's face or to prevent it from drifting out into the rest of the laboratory. Blowers draw in air from the room, through a filter or number of filters within the fume hood and towards an exhaust area.
To safely work in a fume hood, keep all work at least six inches away from the plane of the sash. This will ensure fumes are pulled away from the user. Also, make sure the hood sash remains closed as much as possible and keep the hood slots and baffles free of any obstructions by containers or equipment. Never place your head inside the fume hood when working with chemicals.
The airflow will differ depending on the type of hood you use. For a constant air volume (CAV) hood, the fan has only one speed, providing a stable and continuous airflow. A variable air volume (VAV) hood allows users to adjust the velocity of the exhaust for added versatility, while reduced air volume (RAV) hoods offer lower airflow performance, making them ideal for working with less harmful compounds.
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