The fume hood design, and any additional features, is dependent on what types of. The Protector XL. Sometimes referred to as “recirculating range hoods,” this type of hood filters the air and then returns it back into a workspace. Generally lab hoods are designed to evacuate 100 CFM for every square foot of hood opening. Ductless fume hoods are designed to protect personnel by filtering out dangerous fumes and vapors so that air can be safely recycled back into the work space in an energy-efficient way. If the laboratory is large and the number of fume hoods is low (aka “low hood density”) then the minimum ventilation rate will likely be greater than the make-up air demand for the hoods. Jenis-Jenis Fume Hood Terdapat 2 jenis fume hood yaitu Ducted fume hood dan Ductless fume hood. 21. With a reliable, durable sensor element, monitor provides simple field calibration. Ductless fume hoods are self-contained enclosures that filter air before returning it to the work environment. Includes hood, fluorescent illuminator, blower module, two. General Application Ductless Fume Hoods • Provides Operator Safety and Numerous Features for General Applications 24 “The World’s Most Extensive Selection of Ductless Fume Hoods. Ductless fume cupboards can be placed wherever they are required and adapted to a wide range of applications. 68 - $480. Ductless Fume Hood. Operators should consider fume inhalation risks and utilize respiratory engineering controls, such as a ductless fume hood or exhaust hood, to. Of course, the science is more than just adding carbon to a filter, as you also need to have the proper distribution of air flowing through the carbon filter to. e. Flux is also commonly used in soldering. Proper maintenance of ductless fume hoods starts with a solid filter replacement schedule. Labconco has combined its patented*, fully-featured, containment-enhancing Protector® Hood design with Erlab’s GreenFumeHood® (GFH) Filtration Technology to deliver a multi-use fume hood that requires no ducting. Known for its plug-and-play feature and. Ductless fume hoods. View Items to Compare. The fume hood encloses a work bench area that has a fan unit at the top. Reorder Filters;All areas where it has been determined that a fume hood is required and a ductless fume hood is desired. Modest chemical volumes should be used, around 500 mls or less per chemical. Jenis-Jenis Fume Hood Terdapat 2 jenis fume hood yaitu Ducted fume hood dan Ductless fume hood. Then mount the blower motor with a fan guard on top of the box. A vapor adsorbing ductless fume hood is a self-contained enclosure that uses carbon molecular filters to trap toxic gases and odors from acids, organics, aldehydes, and amines. Country of Origin: Made in India. Floor-mounted (walk-in) hoods from 48” to 144” wide and up to 96” deep. The Thermo Scientific Hyperclean TruAir fume hood product line features filtration technology that creates The Purair ® Basic ductless fume hoods are designed to provide high level performance features at an affordable price. I talk about my homemade fume hood: the cost, type of materials, general design plan, and give a few tips. It also features a double-hinged sash with arm ports that provides good working. $5,988. Protector™ XL™ Fume Hoods with By-Pass Block are low velocity and high performance. Ductless fume hoods are equipped with a fan to pull in contaminants. Additionally, replacing traditional fume hoods with ductless fume hoods saves energy efficiency both in terms of hood operation, and heating and cooling costs. Consult local, state and federal agencies regarding the suitability of your application prior to venting fumes to the environment. 6 m/s. Name and Email are required. Interesting and original video coming next weekend!. Fume hoods are designed to provide personnel protection from toxic or volatile chemicals by continuously shifting airflow away from the user and to the work area. ₹ 81,000 Get Latest Price. Because the status of the chemical fume hood can change anytime, continuous air flow indicators are recommended. So after being inspired by the countless DIY fume hoods, like this one, he decided to try his hand at it. Protector ® ClassMate ® Hood. Cleatech Ductless Exhaust Fume Hood, 32″ Portable , Clear Polycarbonate. Between 600-900 CFM, install 6” duct. 24” (61 cm) deep clear interior. Between 900 and 1200 CFM, go with 8” duct. The. 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. Product Type. Use for locations where outside ventilation cannot be achieved. The ductless fume hood is self-contained and does not require venting to the outside. Fotile 30-Inch Under-Cabinet or Wall-Mount Range Hood. Narrow Down Where. Besides noble gases, carbon filters don’t always retain carbon dioxide, carbon monoxide, and nitrous oxides, which are often easily managed by lab air turnover. Without carbon filters, it is impossible to capture any molecule. Unlike traditional fume hoods, they require no ducting so they can be moved from lab to. Ductless fume hoods are stand-alone enclosures that use carbon and/or HEPA filters to remove fumes, vapors and particulates from air drawn through the device and then discharge the filtered air back into the laboratory. Our ductless fume hoods are available in a. Fume Hoods. FREE delivery Nov 27 - 30 . A chemical fume hood protects the user while a biosafety cabinet protects the user, the environment, and the material. Preparing the Fume Hood for WorkDucted Fume Hoods. Purity is the truest measure of effectiveness. Robust Hood Construction. Learn about the differences between each type of fume hood design and the various safety standards that apply in this new video from Erlab & Lab Manager. Ductless Fume Hood. Esco Ascent™ Opti (SPD) ductless fume hood offers excellent containment and ergonomic features at a great value. Introduction. Jul 11, 2021. Ductless fume hoods or fume cupboards are often used in laboratories to capture and remove hazardous substances from the air which are produced during certain laboratory applications. Typically used in locations where outside ventilation cannot suffice, a ductless fume hood is a necessity to eliminate high percentages of harmful contaminants to protect users. Ductless fume hoods: Offering flexibility, efficiency, and exceptional air filtration capabilities; Floor-mounted fume hoods: Combine optimal ventilation with a spacious interior for your application; Special Application Fume Hoods: PVC and stainless steel hoods for use with perchloric acid, acid digestion, and radioisotopes. SEEDS project: ductless fume hoods research University of British Columbia 6 1. Our systems utilize powerful fans combined with a variety of pre-filters,. This compact-sized and simplified ductless fume hood is complete with internal lighting, worktop, and microprocessor control system. Ductless fume hoods, laminar flow hoods and biological safety cabinets are all designed to meet the needs of highly specific, extremely diverse situations. AirMax, with wet fume scrubber, is a total solution for minimizing personnel, ductwork and environmental exposure to caustic acid gases. Posted July 22, 2022 by sentryair. Fisherbrand™ Walk-In Standard Chemical Fume Hoods are innovative and purpose driven products for the research and healthcare industries. This makes the hood portable and. Sentry Air Systems’ OSHA compliant Portable Spray Booths are built with stringent quality control measures and superior craftsmanship. . The Ascent™ Max Ductless Fume Hood with Secondary HEPA filter has an efficiency of 99. Typically used in locations where outside ventilation is not an option, these systems feature activated carbon and/or HEPA filters instead of being connected to an external exhaust. 00. For ducted fume hoods, ensure that theA hood with missing side panels or cracked sashes will not provide adequate exposure control. Laboratory fume hoods manufactured by Kewaunee Scientific Corporation, Mott Manufacturing, Baker, Labconco or Lab Crafters are preferred. LCD Touch screen control panel, easy to operate. Building a Small Fume Hood for Stinky Projects: My wife Jennifer makes cast-resin jewelry1. Fume Hoods protect laboratory staff from noxious fumes released by acids, dangerous gas, and organic solutions. No external ducting, building work or changes to heating and ventilation systems are necessary. Mushroom Clean Air Box DIY Portable Laminar Flow Hood Mycology Fume Hood Propagation Station Monotub - White. As a vital piece of laboratory equipment, thorough product specifications help you decide which make and model will work best for your. Building a Small Fume Hood for Stinky Projects: My wife Jennifer makes cast-resin jewelry1. • A low airflow alarm warns of insufficient face velocity. $489. Advanced carbon filtration technology offers a safe, high performance alternative. This is a self contained ductless hood unit, equipped with integral carbon filter, vapor proof light, vertical sash and controls, and completely molded…AireStream Laboratory Fume Hoods. 7 in. • Easy to Install: The ductless fume hood is self-contained and does not require venting to the outside. Ensure that you seal the edges with silicone to prevent air from leaking. The fume hood was a simple build from inexpensive mat. Also designed to protect an RNA or DNA sample from contamination the Captair Bio range uses air from. If you can identify where the make up air is entering the room (usually around the door / window or the AC),. The more powerful the hood, the larger the duct. Per ASHRAE 110-2016 a properly working fume hood should have a face velocity between 0. Also, the fume hood performance can be tested in LabGuard’s state of the art in-house fume hood test facility. Ductless Enclosure . Use for locations where outside ventilation cannot be achieved. Hauslane WM-538 Wall Mount. The fume hood was a simple build from inexpensive mat. Supports wide array. Carbon-based filters can adsorb organic, formaldehyde, acid gas, sulfur compounds and ammonia chemical fumes and vapors. DUCTLESS FUME HOOD FEATURES & BENEFITS • DFH are available in 3 standard sizes. The carbon filter is sized to fit the specified product model number and configured to optimize airflow across 100% of the filter surface area. Cole-Parmer® FHD-400 Advanced Ductless Fume Hoods with Filte…. At the heart of the Purair Advanced ductless fume hood product line is the innovative Air Science® Multiplex™. Protects the operator from fume and particle hazards. 6 m/s at proper sash height level. eGuard® communication software offers real-time monitoring on the user’s phone or computer. Has a long and deep tray to capture the oil and grease that the filters don’t. 00 USD. I thought these kinds of ductless hoods are specifically for biological assays. In this type of fume hood, the air is treated within the unit using extensive filtering systems — typically incorporating some form of activated charcoal filtration. Variable airflow monitoring and control to ensure efficient operation;Ductless fume hoods operate off a carbon filter system, which recirculates filtered air into your laboratory. Filter I. Esco Ascent™ Opti Ductless Fume Cabinet is equipped with features previously found only on high-end ductless fume cabinets to protect your laboratory personnel from toxic chemical fumes. 25″ x 30″. Cut a window in your last panel. For bench top, counter tops or cabinetry & casework. 38 products. . Glacier BCSD1 30-in 300-CFM Convertible Black Under Cabinet Range Hoods Undercabinet Mount. Our laboratory fume extractor is widely used in medical research laboratories, chemical. Airflow costs an estimated $8 USD per cubic foot per minute (CFM) on average, with a range from $5 to $13 USD depending on the climate of the lab’s location. •Choose ducting that’s the same size as or slightly larger than the vent opening. A ductless fume hood is customarily more costly than a ducted hood when labor isn’t factored in. Request for Quote. Thomas Numbers 1167M01-M04: Units do not have a blower and require a…. Product Information Benchtop fume hood, depending upon your application, is an economical and compact option to the static fume hoods. Use of a "ductless fume hood" is strongly discouraged. The distance between the sash of the fume hood and a doorway should be at least 4’ 6”. Esco’s research scientists and engineers, working in con-Purair® Basic ductless fume hoods are designed to provide high level performance features at an affordable price. Esco ductless fume hoods are independently tested by INVENT‐UK for the ability to filter contaminated air with efficiency and retention capacity as required by the British Standard BS 7989 and French Standard AFNOR NF X 15‐211. Fume hoods function by maintaining a relatively negative interior pressure while continuously drawing air through the sash opening, which prevents contaminants from escaping. MSDS data sheet for specific details of each chemical used. Ductless fume hoods can be customized to capture a wide variety of chemical families, saving money and resources by allowing more work to be performed with a single fume hood. 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. Available in ducted or recirculating formats, the front sash may be moveable and is constructed from clear safety glass for easy. $ 10,728. 4K subscribers Subscribe 23K views 10 years ago This is the first part in a series of. 00 $ 137. 2. Depending on its design, the sash may move vertically or horizontally, or a combination of the two. com. The first step is to cut the materials to the required size. Harm may occur to the operator,. Product Type. Ductless Fume Hoods. The ductless fume hood, containment hood systems are designed to. We suggest you get. . Filters of this type are generally inexpensive, and last for approximately six months depending on. proof light, vertical sash and controls. It’s a. The most common type of fume hood, bench top units are installed on top of lower base units and most typical cabinets (base cabinets). DESIGN Professional quality Air Science fume hoods comply with current technical and safety regulations. ** 48″, 60″ and 72″ ductless hoods includes two 1200 CFM blowers and requires two sets of filter. Fume hoods are both a protective and control device fitted in laboratories where chemicals are used. Type of Chemicals Used. Because of the toxic fumes, good ventilatio…. 4609 • sales@sentryair. Ductless Fume Hoods are self-contained workstations that help to protect the operator and immediate environment from harmful airborne fumes and particulate. We like the Broan-NuTone BCSQ130SS Three-Speed Glacier ductless range hood 30 inch as our top pick. Occupational Health and Safety • 2. They are equipped with integral exhaust blowers and do not require duct or venting to the outside. 799. Compare this item. The AirHawk ductless fume hood offers a centralized control panel with adjustable controls for light and fan speed and displays the air pressure and runtime information. Over time, filters become saturated with the chemicals they’re designed to intercept. Draw away harmful acid fumes with the Labconco Protector™ Acid Digestion Hood, a PVC hood with bypass airflow design. Ductless fume hoods cut energy bills by filtering and recirculating heated or cooled air back into the laboratory. Selain itu, fungsi fume hood adalah untuk mencegah pelepasan zat berbahaya ke dalam ruangan. Laboratories that handle light to moderate. In ordinary times, keeping the work area and. It recirculates the air through multi-stage filters to capture and remove dust, smoke, and fumes before they enter the work area. com801-970-1212. Harmful and unpleasant chemical fumes are removed from the controlled environment to facilitate a safe and pleasant work environment using an external fan installed on the roof or on an external wall. The water used during the scrubbing process is captured in the holding tank and recirculated. Ductless Enclosures & Fume Hoods . Use a drill to make a hole and then work your way in with the jigsaw. Dynaflow Ductless Fume Hood is a logical option because: Portability: The cupboard does not require connection to extraction systems. Robust hood construction for a long lasting. A Ductless fume hood also known as a portable fume hood, is great for use in existing buildings where the ductwork is inaccessible, where mobility is necessary or cost is an issue. • Energy Efficient. com 30” Ductless Fume Hood - Generation II MADE IN THE USA SINCE 1983ductless fume hood is self-contained and does not require venting to the out-side. Ascent™ Opti. Easy to locate and install. Classroom Ductless Fume Hoods. #6. Indoor. Has a six-inch round vent to fit most kitchen pipes. Best Bang for the Buck. The objective of the filtration system is to reduce the levels of solids, gases, or vapors to that below the acceptable occupational exposure limit at the exhaust. • DFH filter assembly is easy to access, easy to change. Height (Metric) 149. Ductless Exhaust Fume Hood -- 2900-20. 7. Safe operation at 60 fpm. Low static rectangular exhaust duct. Introduction. Neutrodine® Unisorb Filtration Technology offers comprehensive molecular filtration. Quiet efficient operation powered by 530 cfm blower. It is ideally suited for use with non-hazardous contaminants and when flexible access to the equipment in the work. Ductless fume hoods are designed to protect personnel by filtering out dangerous fumes and vapors so that air can be safely recycled back into the work space in an energy-efficient way. Because the air that is pulled into the hood is not filtered, fume hoods only offer protection to its users and no protection to the. One of the questions we often encounter is, whether the choose a traditional ducted fume hood or go for the ductless hoods. Myth #3: “Explosion proof hoods are designed to protect the user in the event of an explosion”. Turn off the power to the range hood, then unscrew the wire nuts and disconnect the wires. NF X 15-211 Ductless fume hoods - Classe I. Ducted vs Ductless Range Hoods. 00. Fume hoods are often the most used piece of equipment in research laboratories and frequently shared by lab personnel. This unit is equipped with a main carbon filter and is used for general applications such as dilution, mixing, buffer preparation, etc. Interesting and original video coming next weekend!. Temperature and humidity sensors, can detect indoor temperature and humidity. A system of endless benefits, providing flawless protection throughout the lab and beyond. application for ductless fume hoods. Esco Ascent™ Opti (SPD) ductless fume hood offers excellent containment and ergonomic features at a great value. Downsides. The leaf. Aeromech make laboratory chemical fume hood is first and foremost a safety device. Once the air is drawn in, it moves through a filter called the pre-filter. Set. High efficiency EC blower. Brand: Chemietron. Energy saving LED lighting. 2. Because filtered air is returned to the room, no Ductless fume hood, sometimes called carbon-filtered enclosure or filtered fume hood, are self-contained, filtered laboratory enclosure that remove hazardous fumes, vapors and particles from the laboratory. 5. Is a fume hood the same. A ducted fume hood that requires 500 CFM could cost as much as $4,000 USD per year to operate. Unlike traditional fume hoods, installation costs are very low and no ductwork is required. The mobile fume extractor / fume exhauster is an air purification system which can provide the partial high pure environment. List: $189. Paramount Ductless Enclosures (also known as ductless fume hoods) use carbon filters to rid the work area of hazardous fumes and vapors. Ductless Fume Hoods - Negative Pressure - Table Top - Chemical Containment Hood - Workspace: 34"W x 17"D x 17"H AF-G-36. $137. This type of fume hood utilizes carbon or HEPA filtration to protect laboratory personnel from toxic chemical fumes, odors, and particles. with 6’ power cord, light switch, all fiberglass construction, 24” W X 24” H X 15” D Compliant UL, CSA, and CE (International) 24225. This high-capacity, turnkey fume hood features dual blowers to ensure a safe exhaust flow speed >/= 100 fpm (. If you prefer, you may contact us by calling 800-799-4609, or e-mail us at [email protected] Hood Design. Known for its plug-and-play feature and mobility, Ductless Fume Hood guarantees a hassle-free installation and no lab work interruption. 6. At Canadian Scientific Inc. Tags: Ductless Fume Hood Fume Hoods Health & Safety Product Focus. Use HVAC foil tape to hold everything together and make it airtight. That means knowing precisely what type of work will be performed in the fume hood and making the choice between constant air volume and variable air volume,. Items 1 - 12 of 23. Ductless Fume Hoods; Laminar Flow Hoods; PCR Laminar Flow Cabinets; Biological Safety Cabinets; Forensic Lab Equipment; Vented Storage Cabinets; Balanced Enclosures; Custom Enclosures; Downflow Workstations; Classroom Demonstration; Total Exhaust; Ceiling Filtration Units; Glove Bags; FILTERS. Our product line is categorized by a combination of product application, function, Air Science brand and typical market use. 120 6th Street Fort Myers, FL 33907 T 239-489-0024 Toll Free 800-306-0656 F 800-306-0677 5 USER OPERATION MANUAL: Purair Basic Series I . These type of fume hoods filter out chemical fumes and recycle air directly back to the laboratory. . Connect the two by drawing a line from point 1 to 2. If the filters are not changed regularly, dangerous fumes and vapors will pass through and return to the work area posing a risk to workers and the laboratory. Ductless fume hoods recirculate laboratory air after filtering out particulates and fumes, instead of venting contaminants and the large volumes of air containing them. AirClean Systems ductless solutions incorporate advanced state-of-the-art microprocessor safety controllers and revolutionary gas phase bonded carbon filters. Once you’ve got the materials precut and sized, the next step is to cut the edges. This type of fume hood utilizes carbon or HEPA filtration to protect laboratory personnel from toxic chemical fumes, odors, and particles. It is the result of Labconco’s more than 60 years of experience in manufacturing fume hoods, and users like you suggested many of its features to us. Ductless fume hoods are a primary alternative option. A ductless fume hood is an alternative to conventional fume hoods. Protects the operator or class from toxic fumes and (with added HEPA/ULPA filter) particle hazards. Contaminated air passes through the scrubber’s water-washed contact media before being exhausted. Comfee CVU30W2AST Range Hood 30 Inch Ducted Ductless Vent Hood Durable Stainless Steel Kitchen Hood for Under Cabinet with 2 Reusable. A fume hood is a ventilated enclosure in which gases, vapors and fumes are contained. They are available with a variety of HEPA and carbon filters with convenient front access for replacement and an exhaust point for connecting a second filter or an external exhaust. Many units are portable and may be moved from one location to the next with minimal down-time and without filter changes. We. Indoor/Outdoor. Sash (Shutter): Counter - Balanced Vertical sash of Polycarbonate (5 mm Thick). This type of fume hood is suitable for applications involving solid particles, chemicals in powdered form and aerosols. 00USD / Each. 16 CAD / Each. Due to the great variety of chemicals that might be used in a research setting, it is difficult to predict the effective. All air that flows through these stand alone fume hoods will get recycled back into the laboratory space. This model is available in stainless steel, matte black, and matte white finishes, making it the best under-cabinet range hood to complement most kitchens. Hauslane Chef Series WM-639 Wall Mount Range. Add to Compare. 5 linear feet of hood space per person . By combining HEPA-filtered incoming air with a traditional ‘total exhaust’ hood configuration, clean turbulence-free air blankets the. Air inside the enclosures passes through carbon filters, and in some cases additional HEPA particulate filters, before being safely. Energy Expenditure/ Running Costs: Here ductless hood is a clear. 6 ft (800 mm) length Ductless Fume Hood, with AFNOR NFX 15-211 and SEFA 9 filtration efficiency standard (classes 1 and 2). There offering of chemical filtration fume hoods and cabinets continues to meet all air filtration needs to provide a safe and protected laboratory. This type of fume hood utilizes carbon or HEPA filtration to protect laboratory personnel from toxic chemical fumes, odors, and particles. The hood is constructed of chemical-resistant epoxy-coated steel for added mechanical strength. $3,567. TopAir Ductless Fume Hoods are made of high-quality non-corrosive polypropylene with excellent chemical resistance that regular metal hoods cannot compete with. A fume hood is a ventilated enclosure used to control exposure to hazardous or odorous chemicals. Ductless fume hoods, sometimes called carbon-filtered enclosures or filtered fume hoods, are self-contained, filtered laboratory enclosures that remove hazardous fumes, vapors and particles. Chemical resistant liners to protect the interior of the fume hood against damage from any chemicals. Total daily contaminant exposure per employee should not. More options with sizes and configurations. Under the conditions present on the date of this test, the Sentry Air Systems ductless hood created a safe working environment similar to what NIOSH requires for the operator and eliminated 98% of acetone vapors from the airstream. Benchtop fume hood, depending upon your application, is an economical and compact option to the static fume hoods. TopAir Ductless Fume Hoods are made of high-quality non-corrosive polypropylene with excellent chemical resistance that regular metal hoods cannot compete with. The dangerous vapours are confined in the enclosure, then are cleaned while going through the active charcoal filter. There are certain gases that filters will never clean. Vesta Arlington Under-Cabinet Range Hood. $2,421. The design of this hood is beautiful and functional, and the buttonless display. 2. Wide. Find My Store. Build a hood with an appropriately sized blower and add a scrubber to remove emissions in need of scrubbing, like NOx, or the Sulfur Dioxide. The primary purpose of the fume hood is to contain gases, vapors and fumes and then exhaust them out of the area. Because filtered air is returned to the room,Think of those as the energy hog of the lab. Weight (Metric) 115 kg. Whether or not a fume hood is necessary depends on the concentration of the vapor and the length of exposure. Protects the operator from fume and (with added HEPA/ULPA filter) particle hazards. Ductless fume hoods are designed to be used with a wide range of applications to protect you and the environment. -- Specify Purair P5-36, shown with Multiplex Filtration System. Ductless Fume Hood. Cole-Parmer® FHD-400 Advanced Ductless Fume Hoods with Filte…. Hauslane Chef Series WM-639 Wall Mount Range. Ductless fume hoods, or filtered fume hoods, are self-contained, filtered enclosures that remove hazardous fumes, vapors and particulates from the immediate environment. • A unique filter clamping design eliminates bypass leakage outsideWhether it’s a focal point in your kitchen, or concealed in custom cabinetry, trust Broan-NuTone—the leader in residential ventilation—to provide the optimal solution. OSHA 29 CFR Part 1910. It is not intended as a disinfectant. 9. Indemnity4 • 4 yr. Web Fume Hood Filters From Grainger Can Help Protect Lab Personnel From Dangerous Airborne Toxins. Each laboratory should be provided with efficient fume hoods, equipped with a sink for the washing of apparatus used for handling toxic materials. . See your. Height (English) Sash Opening. 95″ x 29. Purchaser of a DFH can be a Project Manager, an Area Manager, a PI, a department administrator, or any. 7 inches deep to accommodate any need. Instead of sending exhaust air outside, these hoods draw the air through a filter to remove chemical vapors. New chemical fume hoods must be equipped with air flow monitoring devices which will alert the user if there is a problem. Air Cleaners provide a secondary safety. Benefits. Known for its plug-and-play feature and mobility, Ductless Fume Hood guarantees a hassle-free installation and no lab work interruption. 100% RE-CIRCULATORY (DUCTLESS) FUME HOODS: A ductless, self-contained, carbon and/or HEPA-filtered enclosure, that draws air into the front of the hood, passes it through multi-stage filters, and then re-circulates it into the lab.