Fume Hood Cabinet
A fume hood cabinet is a special type of laboratory work equipment with an enclosure on top that can contain the effects of the experiment being run within it.
Description
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Beito Laboratory Equipment Co., Ltd. is a laboratory furniture and laboratory equipment manufacturer integrating R & D, design, manufacturing and sales.
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Our products are widely used in medicine, chemical industry, commodity inspection, quality inspection, environmental testing, electric power, universities and other units.
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We have mechanical and electrical installation, decoration and laboratory furniture sales, all of which have passed the ISO9001 quality management system certification, ISO14001 environment management system certification and OHSAS18001 occupational health and safety management system certification.
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Our products include: All wood, steel wood, all steel, PP structure test bench, fume hood, medicine cabinet, utensil cabinet, sky platform, cylinder cabinet, exhaust gas treatment tower, activated carbon adsorption box, fan, air duct and other laboratory supporting equipment.
A fume hood cabinet is a special type of laboratory work equipment with an enclosure on top that can contain the effects of the experiment being run within it. It is designed to ensure safety for the user and other inhabitants of the room, and it should be able to filter out any harmful gasses. A fume hood cabinet may also provide protection from small explosions or splashes. It must have a built-in mechanism to strongly suck the gasses out of the working area within the enclosure.
Fume Hood is used to protect lab environment and operator during general chemical applications. It actively protects operator from inhaling toxic vapors and dramatically reduces the risk of fire and explosion.
A ductless fume hood is a stand alone, compact workstation that provides a continuous flow of air that filters hazardous fume vapors out, recirculating clean air back into your working environment.
Fume Chamber In Chemistry Laboratory
Laboratory fume hood add-ons include activated carbon filters for removal of non-hazardous, nuisance odors. HEPA filters can also be added to a light duty fume hood to remove microscopic dust and microbes.
Biological safety cabinets are used to provide primary containment in the laboratory when the investigator is using potentially infectious materials.
Silent turbine fan draws chemical vapors from bottles into a HEPA filter with high absorption capacity. No static, no spark and super silence motor. Various type filters to realize 99.99% high efficiently filtering.
Front window which is made of thick transparent toughened glass maximize light and visibility inside the fume hood, providing a bright and open working environment.
The front plate and side plate: The main material ≥ 6mm acrylic plate, excellent weather resistance, excellent chemical resistance, not easy to aging, colorless and transparent, transparent body, visual comfort, beautiful and generous.
LED lamp power 25W lamp, does not produce heat, security does not affect experimental ambient temperature, energy saving, environmental protection and long service life.
The fume hood monitor LCD display screen,real0time display of the face velocity speed and control valve state ,to remind the user the fume hood's usage state.
Advantages of Fume Hood Cabinet
Fume hoods have proper ventilation
Breathing in harmful chemicals can cause toxins to lodge in your lungs or enter the bloodstream. While inhaling vapors may only result in dizziness at first, over several years it can cause liver damage. By design, a fume hood provides a barrier between lab workers and toxic fumes by filtering the air inside the laboratory.
Fume hoods are designed for explosions
While they aren't designed to handle every incident, a properly installed fume hood will protect from small explosions and fires. The sash acts as a shield in the case of an explosion or fire. It is designed to withstand impact, so in the case of an explosion, the glass will "spider" instead of shatter.
Fume hoods control and contain spills
Spill containment lips help to contain minor liquid spills. These lips are several inches wide and act as catch basins for spills or breaks. These "troughs" are the new standard for fume hoods, but most older hoods don't come with this feature. However, additional spill containment products can be purchased for older hoods
Types of Fume Hood Cabinet
These are the most common types of fume hoods you will see in most laboratories or industries. They draw air from the lab space itself and push them out through air ducts to the environment outside the lab or through a filter unit. Sometimes these fume cabinets or fume closets use a "return air system" which recirculates air through a filtration system and feedback loop. This way, you can perform an experiment in a completely closed environment, without opening the hood shutter at all.
These fume cupboards don't have a vent, but have a large filter unit mounted on top in front of the fan. The blower inside sucks in air from the room through the front opening, takes the gasses or fumes inside the box, and passes them through the filter, finally throwing the filtered air into the room again. The filter unit in a ductless fume hood consists of two phases ‒ the pre-filtration layer which can be just thick foam, catching all the large particles.
Some experiments may emit fumes that are heavier than air. A standard fume hood with the blower mounted on top isn't very effective in gathering up those gasses ‒ you'll need another way. This is where a bottom-mounted blower comes in handy. The floor of these fume hoods is basically a mesh or perforated sheet and the air flows from the top to bottom.
Other than the above, there can be many other types of fume hoods, depending upon the application. Some fume cabinets protect you from radiation, some can protect you from explosions. Some hoods are prepared to deal with highly corrosive materials like hot hydrofluoric acid. Some fume closets have their vents pass through scrubbers which dilute the harmful fumes and drain them out. A special type of fume hood can wash the interiors of the hood enclosure to flow out the box through a fitted drain.
Material of Fume Hood Cabinet
Wood
Laboratory managers and technicians have trusted wood for generations. For over 60 years, this readily available resource has been the "go-to" material of choice to create bespoke lab furniture and fume cupboards. In fact, some of the oldest examples of fume cupboards are static wooden boxes with nothing more than a sliding sash.
Metal – Mild Steel (often with a coating of Epoxy or similar)
Eventually, when wood gave way to metal, the benefits of introducing a stable material and smooth-running sashes were welcomed. Having said that, the irony of using metal soon became evident. Unfortunately, this abundant resource suffers from a lack of corrosive protection. In particular, it's vulnerable to rust, although it does offer excellent heat resistance.
Metal – Aluminium
Whilst Aluminium offers slightly more rust protection than steel, it's still incredibly prone to corrosion. It's also expensive to produce but does provide excellent heat resistance.
Metal – Stainless Steel
Generally, stainless steel performs exceptionally well in most applications, thanks to its durability. However, there are a few unfortunate caveats:
● A small number of chemicals can cause "pitting".
● It's incredibly expensive, although the heat resistance is superb, making it the preferred material of choice in some specialist applications such as handling radioactive material.
Polypropylene
Polypropylene is undoubtedly the material of choice when constructing modern fume cupboards. It's corrosion-resistant, rust-free and stain-free in addition to being lightweight with excellent thermal insulation. The icing on this fume encrusted cake? Polypropylene requires no powder coatings or paint.
Application of Fume Hood Cabinet
Education science labs
Our first effective use of fume cabinets is to give school, college and university students a safe space to perform experiments. These could be mixing chemicals, pouring liquids into test tubes, or actions like stirring, mixing and weighing. Whatever they're being used for, our fume cabinets are designed to keep students safe from potentially harmful vapours and particulates.
Military weapons development
Another of our different uses for fume cabinets is one that may surprise you. One of our customers creates defence systems and uses their fume cabinet to analyse explosives. The cabinet we provided them is a high-end, explosion-proof unit, which really does show just how bespoke our fume cabinet solutions can be.
Medical and dental research laboratories
Medical research (including the dental offshoot) is one of the more well-known examples of general applications for ductless fume cabinets and ducted fume hoods. Being specific, the cabinet could be used in the creation of vaccines or antibiotic medicines, allowing researchers to perform experiments without fear of breathing in potentially harmful particulates.
Automotive and aerospace research
Automotive and aerospace manufacturing are both ripe with reasons to use fume cupboards. From fuel synthesis to plasticiser research and the application of industrial-strength glues, the different safe uses of fume cabinets in this industry are many and varied.
Electronics manufacturing
If making enormous vehicles wasn't enough, fume hoods can also be used in the creation of something as humble as soldering a simple table lamp. Used correctly, a suitable fume cupboard will offer effective protection against breathing in harmful solder fumes.
Podiatry product assembly
This is another effective use of fume cabinets that you might not think of unless you work in the extraction space. We have a long-standing client who creates specially designed shoes for disabled people, and uses their fume cupboard for glueing the soles to the rest of the shoe.
Theatre company prop creation
Our seventh and final example really does show the wide variety of different applications for fume cabinets. While medical, education and even military applications might make sense when you think about them, would you really expect to find a fume hood in a theatre? However, when you consider the amount of glueing and painting of props that goes into putting on a production, it just makes sense for such a place to source a fume cupboard.
Components of Fume Hood Cabinet
Hood body
This is the part of the fume hood cabinet that is clearly visible and serves to trap hazardous fumes.
Fume hood cabinet sash
The sash is the adjustable portion of the front opening that users can raise or lower to access the interior workspace. Every fume hood cabinet will state the optimal configuration required for properly containing the chemicals. For the fume hood cabinet to work efficiently, it is important to follow the sash guidelines. When not in use, the sash should be closed. A fume hood cabinet is not meant for storage, so remember to remove all chemicals before closing the sash.
Baffles
Baffles are movable partitions. They are used to create slotted openings along the back of the hood to equally direct the air that is being exhausted out. When adjusted properly, baffles will eliminate any dead spots and optimize the efficiency of the fume hood cabinet in capturing the contaminated air.
Related
Understanding the Importance of fume hood cabinet Baffl.
Work surface
The work surface is the area below the hood where the laboratory work is performed. This could be a bench top or alternatively, the floor of a walk-in fume hood cabinet.
Airfoil
The airfoil is located along the bottom and side edges of the fume hood cabinet. Airfoils help to simplify the airflow and prevent whirls of air known as eddies from carrying contaminants out of the hood and into the work area. There is also an open space below the bottom airfoil that works as a place for the hood to exhaust when the sash is completely closed.
Face
The face of the fume hood cabinet is the plane that exists between the bottom of the sash to the work surface. The hood pulls air from the laboratory into the fume hood cabinet through this opening. It also serves as the entry point to the work area. This is where face velocity is measured.
Exhaust plenum
The exhaust plenum helps to equalize airflow across the fume hood cabinet face.
A fume hood cabinet is a ventilated enclosure in which gases, vapors and fumes are captured and removed from the work area. An exhaust fan situated on the top of the laboratory building pulls air and airborne contaminants through connected ductwork and exhausts them to the atmosphere.
The typical fume hood cabinet found in laboratories is equipped with a movable front sash and an interior baffle. Depending on its design, the sash may move vertically, horizontally or a combination of the two and provides some protection to the hood user by acting as a barrier between the worker and the experiment.
The slots and baffles within the hood direct the air and, in many hoods, can be adjusted to allow the most even flow. It is important to prevent the baffles from becoming blocked, by excessive material storage or equipment, since this significantly affects the exhaust path within the hood and as a result, the efficiency of hood capture.
The beveled frame around the hood face, called the airfoil, allows for even air flow into the hood by eliminating sharp curves to reduce turbulence.
Proper Fume Hood Cabinet Techniques and Practices
Like other equipment in the laboratory, fume hoods should be cared for and handled with caution to allow them to keep serving their purpose, i.e., contain toxic gases and prevent airborne-related accidents and fire. Follow these to maintain safety when dealing with laboratory fume hoods:
● Keep the lab doors closed.
● Always keep the sash panels closed as much as possible.
● Do not remove the sash except when necessary, e.g., apparatus set-up. Make sure to replace the sash or panels before working in the hood.
● Ensure that the baffles are free of obstruction by shelving units, large equipment, or any apparatus. Keep all apparatus inside biological safety cabinets.
● Keep all apparatus at least 6 inches back from the face of the fume hood. The same goes with personnel; make sure to work away from it with the same distance.
● Do not store apparatus or chemicals in the hood as they will block the air flow. Chemical bottles in the hood must be sealed.
● If one must place something inside the hood or take something from it, do it in swift by calm manner to prevent the contained toxic fumes from escaping.
● Do not use fume hoods for waste disposal.
● All personnel who work in the fume hood should wear personal protective equipment (PPE).
● Any practice inside the lab that may generate hazardous substances at or above the Permissible Exposure Level should be done inside the hood.
● Do not put your head inside the fume hood when hazardous substances are being generated.
● As much as possible, minimize foot traffic near the hood's face.
● Do not put electrical cords inside the hood. They may cause flammable gases and liquids to ignite.
Epoxy Coated Steel
These liners are typically used in non-corrosive environments. If acids were to spill on this material, action must be taken as corrosion will occur. This liner is very economical and is heat-resistant.
Stainless Steel
When considering a steel option, fume hood liners typically come in Type 304 or Type 316 Stainless Steel. These types of liners are designed to provide greater life expectancy in harsh environments. The difference between the two is their makeup. Type 304 stainless steel contains 18% chromium and 8% nickel while Type 316 contains 16% chromium, 10% nickel, and 2% molybdenum. The molybdenum is added to help resist corrosion to chlorides.
Polyvinylchloride (PVC)
Also known as poly or vinyl, this widely produced synthetic plastic polymer is chemically resistant to acids, salts, bases, fats, and alcohols. Typical applications involve acid digestions with chemicals like perchloric, hydrofluoric, sulfuric, and nitric acids. This material is also commonly found in wash-down stations. It has moderate resistance to heat and moderate structural strength.
Fiberglass Reinforced Composite Panel
A fiberglass-reinforced composite panel liner is the most common fume hood liner. This inexpensive liner material offers high chemical resistance coupled with low smoke and flame toxicity properties. It also provides great temperature control, durability, moisture resistance, and structural strength.
Molded Fiberglass Reinforced Polyester
The molded fiberglass reinforced polyester offers a sleek, one-piece liner. It is corrosion and fire-resistant and makes for easy cleanup. Due to no internal seams, the interior has no cracks where contaminants can collect leading to fewer points of deterioration and longer life expectancy. The high light reflectivity surface is designed to withstand exposure to a wide range of acids, solvents, and alkalis.
Common Testing Procedures for Fume Hood Cabinet's Maintenance
Face Velocity Measurement Test
Face velocity measurements determine the average velocity of air moving perpendicular to the hood face. The measurement is expressed in m/s or fpm. Face velocities will often provide information concerning the fume hood's ability to properly control contaminants.
Airflow Visualization
Local and gross airflow visualization tests are conducted to observe airflow patterns inside the work area. This test qualitatively checks a hood's ability to contain vapors. Airflow visualization, also known as smoke pattern test, can detect any leakages in the cabinet's design if fumes can be seen escaping from the hood.
Tracer Gas SF6 Containment Test (Optional with separate costs)
Using Sulfur Hexafluoride, this test checks how efficient and effective the fume hood is for containing hazardous fumes. This test consists of 3 parts: static gas leak, face hood surface scan, and sash movement effect.
Carbon Filter Test (Applicable for Ductless Fume Hoods, Optional with separate costs)
RAE meter is used to check if the carbon filter is still functional or if it is saturated and needs to be replaced. The RAE meter is placed at the exhaust of the ductless fume hood and will detect the concentration of VOCs present. A high concentration of signal indicates that the filter is saturated and must be changed.
Light Intensity and Noise Level Test (Optional, with separate costs)
These tests check if the fume hood's light intensity and noise level are within the acceptable range. This is to ensure that the fume hood is ergonomic and will not cause distractions to the operator.
● Clean the work surface and walls with an appropriate disinfectant agent or soapy water. Do not use chlorine-based solutions or bleach.
● Clean the sash window using an appropriate glass cleaner.
● Use a damp cloth to clean the exterior surface of the fume hood, particularly the front and top to remove accumulated dust.
● Use clean water for rinsing and to wash away any residue of disinfectant agent, soapy water, and glass cleaner.
● For removing stubborn stains or spots on stainless steel surfaces, use MEK (Methyl-Ethyl-Ketone). Rinse immediately with clean water and liquid detergent. Use a polyurethane cloth or sponge for washing.
● Ensure that there's no blockage in and behind the baffle.
Our Certifications
We have mechanical and electrical installation, decoration and laboratory furniture sales, all of which have passed the ISO9001 quality management system certification, ISO14001 environment management system certification and OHSAS18001 occupational health and safety management system certification.
Our Factory
Beito Laboratory Equipment Co., Ltd. is a laboratory furniture and laboratory equipment manufacturer integrating R & D, design, manufacturing and sales. We have a steel wood and PP workshop covering an area of 3000m2, a steel workshop covering an area of 3500 m2, and a complete set of spraying assembly lines. It is a large-scale laboratory equipment manufacturing enterprise in China,focusing on the field of high-end laboratory engineering.
Ultimate FAQ Guide to Fume Hood Cabinet
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