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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 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 | ||||
Don't store anything in your hood
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.
Perform periodic tests of your hood
Test the face velocity of your fume hood at least annually. Things may change in the mechanical system and face velocities may decrease, making for unsafe conditions for the operator. The operating face velocity should be chosen based upon the manufacturer's published data, and the safety officer's input after taking into account procedures inside the fume hood.
The manufacturer's published data is usually 60-100 fpm face velocity for general chemistry use. Taking a face velocity profile will allow the certifier to become aware of cross-drafts due to supply air sources or others issues in the lab. Becoming aware of these issues keeps the laboratory in check for inefficiencies and unsafe areas.
• 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.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. What chemicals or particulates are going to be used in the Fume Hood?
There are general hoods, ductless hoods, powder hoods, acid hoods, explosion proof hoods and many more specialty hoods. Identifying the chemicals that will be used in the hood as well as the particulates and chemical volumes and methods that will be performed in the hood will help to determine which type of hood best fits the application. Also along these lines, will hot plates or other heat producing items be used in the hood?
3. 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.
4.What service fixtures are needed in the hood?
There are many types of services and accessories that are typically found in a hood. Vacuum, water, and gas lines are the most common service fixtures added to hoods, and airflow monitors, sash stops and auto sash returns are the most common accessories.
Ask yourself how many service fixtures you will need and where to locate them. How many electrical outlets? Is a sink needed and what is the desired placement?
Airflow monitors are recommended. What type is best for your lab--simple red light/ green light indication or digital airflow readout?
Do you want a sash stop to keep the sash in the safest operating position and reduce operation costs?
5. 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?
6. On what are you going to place the fume hood?
Is there available existing bench space? Do you need to place the hood on chemical storage cabinets where acids, solvents and general chemicals can be stored safely? Most hoods require a specifically designed work surface. Do you want your work surface to be dished to contain spills or to include a sink?
7. 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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