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A fume hood (sometimes called a fume cupboard or fume closet) is a type of local ventilation device that is designed to limit exposure to hazardous or toxic fumes, vapors or dusts.
A fume hood is typically a large piece of equipment enclosing five sides of a work area, the bottom of which is most commonly located at a standing work height.
Two main types exist, ducted and recirculating (ductless). The principle is the same for both types: air is drawn in from the front (open) side of the cabinet, and either expelled outside the building or made safe through filtration and fed back into the room. This is used to:
-protect the user from inhaling toxic gases (fume hoods, biosafety cabinets, glove boxes)
-protect the product or experiment (biosafety cabinets, glove boxes)
-protect the environment (recirculating fume hoods, certain biosafety cabinets, and any other type when fitted with appropriate filters in the exhaust airstream)
Secondary functions of these devices may include explosion protection, spill containment, and other functions necessary to the work being done within the device.
| 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 | ||||
Every fume hood needs a blower, and it is often misconceived that a blower comes attached to a fume hood. Will there be a dedicated blower (exhaust fan) for this hood, or will it connect to a central exhaust system? If it connects to a central system, will it be constant volume or variable air volume?
Built-in blowers are easier to install (and therefore less expensive), but they can be noisy and they put the ductwork under positive pressure, so they should be reserved for non-hazardous applications, short duct runs and instances where a remote blower cannot be installed (such as a mobile lab).
Remote blowers, though more complex to install, can be sized for the specific situation and keep the ductwork under negative pressure for safer operation.
Will the duct go directly to the roof, or does it need to make some turns before reaching the roof? What diameter of duct will be used? Once the duct penetrates the roof, a final 90-degree elbow will be needed to turn the duct horizontal, then three to five feet of straight duct is needed between the elbow and blower.
Finally, the exhaust stack should include a zero-pressure weathercap (not a gooseneck, mushroom cap or anything that would block the exhaust from discharging in a vertical, up direction), and should terminate at least 10 feet above the roofline to allow the fumes to reach the airstream and not be returned into the building's air handling equipment.
• Hoods should be evaluated by the user before each use to ensure adequate face velocities and the absence of excessive turbulence.
1. What size of fume hood do you need?
Fume Hoods and enclosures vary in width from 2' to over 12'. They can be from 18" tall to over 12' tall. Knowing what size you require will help you narrow down what type of hoods to consider.
2. How important is the cost of operation?
The cost of operation will be determined by the amount of tempered air that is exhausted from the room. This cost can vary greatly depending on the hood type. Some hoods are high performance so can be operated at lower face velocities than traditional hoods. Some hoods are ductless therefore do not exhaust any air out of the room while others require large volumes of air to be exhausted out of the room in order to maintain containment. Consult your safety officer.
3. Where are you going to place the fume hood?
Where in the lab will the hood be placed is an important question. These considerations determine where a hood can be placed:
Is there an available duct run in the building?
Is the hood out of foot traffic?
Are there any cross drafts or competing air patterns that will affect containment?
Where are the emergency services such as a fire extinguisher or washdown shower?
What is the workflow pattern in the lab?
4. Do you need a blower to exhaust the fume hood, and what size of blower do you need?
A hood is simply an enclosure designed to contain the fumes and provide a safe working environment. It is the blower that does the work by moving air ensuring proper containment. There are external roof-mounted blowers and internal blowers. Knowing the types of blowers your company, institution and building codes require will help you decide the type of exhaust blower to buy for your hood.
The proper sizing of a blower is critical to the effectiveness of your fume hood. Please seek the advice of an expert when choosing the blower size. Information that is needed to size the blower includes fume hood model, duct diameter, length of the duct run, number of 45° and 90° turns in the duct run and type of weather cap that will be used.
You should study your budget and determine if you are interested in spending a little more in the initial purchase of the hood in order to save thousands of dollars over the life of the hood. Balancing purchase price and operation costs should be given much consideration throughout your hood selection process.
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