Ducted fume hood adalah jenis fume hood yang banyak digunakan di laboratorium, fume hood jenis ini bisa langsung dipasang di ruangan laboratorium dengan melubangi dinding laboratorium untuk pemasangan ducting (saluran udara buangan) dan juga scrubber. Product dimensions: 8. Is a fume hood the same. 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. Length: 750, 900, 1,200, 1,500, 1,800 mm. 30″ Ductless Fume Hood. D. Pros and Cons. Fume Hoods and Enclosures. Ducted vs Ductless Range Hoods. But you have to try and manage it! Since air is invisible this can be a difficul. Continuous airflow across the work surface draws contamination away from the user, recycling clean air back into your laboratory. Known for its plug-and-play feature and mobility, Ductless Fume Hood guarantees a hassle-free installation and no lab work interruption. Flow Rate. But this model is intended for the bench top. MSDS data sheet for specific details of each chemical used. Here I show how I built my home-made chemical fume hood for use in gold recovery from electronic scrap. EDU Ductless Classroom Demonstration Fume Hoods. Filter Price. Fume containment and airflow uniformity meet the requirements of ASHRAE 110‐1995, BS 7258, EN 14175‐3 and. If you are going to fix some plexiglass there, think about leaving a little padding. The Protector Echo Filtered Fume Hood requires no ducting and is available in 4', 5', 6' and 8' widths. Compare to ductless fume cupboard, make-up air. We suggest you get. If you can identify where the make up air is entering the room (usually around the door / window or the AC),. Innovation in air purification, unmatched air quality. View All 6. Purchaser of a DFH can be a Project Manager, an Area Manager, a PI, a department administrator, or any. Or ask about. This gives decent airflow to remove the dangerous fumes from the work area. . $ 10,728. Cosmo COS-5MU30 30-Inch Under-Cabinet Range Hood. This type of fume hood utilizes carbon or HEPA filtration to protect laboratory personnel from toxic chemical fumes, odors, and particles. Between 900 and 1200 CFM, go with 8” duct. More options with sizes and configurations. 799. Hauslane WM-538 Wall Mount. Dimensions (L x W x H) 640 x 900 x 1350 mm. With a 400 CFM range hood, install 4” duct. Floor-mounted (walk-in) hoods from 48” to 144” wide and up to 96” deep. With our expert advice and support ductless fume hoods present an environmentally sensitive solution to personal lab protection. Provides total filtration of toxic gases, fumes, odors, and powders. Typical Fume Hood Design. Ductless fume hoods (with carbon filters) All LabGuard fume hoods are type-tested for ASHRAE 110:2016 and EN 14175:2003 performance standards and certified by third-party too. 230 V. The first step to determine the right ductless cabinet for your application is to. 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. Robust hood construction for a long lasting. Ductless Under Cabinet Range Hood with light and Easy Install System in Black. A fume hood is. FLOW Series Laminar Flow Hood, 48" / 1200mm Nominal Width, 115V 60Hz. It is ideally suited for use with non-hazardous contaminants and when flexible access to the equipment in the work. The ducted hood uses three and a half times more energy than an average US home per year. While a ducted range hood is the first choice for most chefs and homeowners, both ducted and ductless hoods have their pros and cons. Have lots of options for services including gas, water, air, nitrogen, vacuum and more. by: James Hobson November 30, 2013 Recognize the Black & Decker unit up top? Yeah, that’s part of a leaf blower. Purchasing filters from sellers who do not comply with. System also includes a memory function in case of power failure. 52004. 00 - $8,995. Ductless Fume Hoods provide protection to both laboratory personnel and the environment from toxic fumes and are quickly becoming a viable alternative to conventional fume hoods. Dynaflow Ductless Fume Hood is a logical option because: Portability: The cupboard does not require connection to extraction systems. The Purair Basic Series ductless fume hood maintains a constant face velocity of 100FPM in compliance with USA and international standardsFume & Particulate Removal Please note our line of ductless fume hoods is not intended for sterile compounding applications. Esco Ascent™ Opti (SPD) ductless fume hood offers excellent containment and ergonomic features at a great value. These fume cupboards don’t have a vent, but have a large filter unit mounted on top in front of the fan. Our ductless fume hoods are safe and convenient to use, and. ADVANTAGE. " The exhaust hood can either be ducted to the outside or a ductless fume hood that uses a carbon filter can be used. e. Install a remote switch away from the fan unit to allow quiet activation. The higher the CFM, the larger the duct. As Savage explains, “air is simply pulled and recirculated back to the lab, unlike a ducted hood where it’s pulled from outside, tempered, introduced to the lab, moved through the hood, and then sent back outside. 1 and A. Ductless fume hoods must have prominently posted signage informing operators and maintenance personnel on the allowable chemicals used in the hood, type and limitations of filters in place, filter change schedule, and a notice that the hood recirculates air in the room. Whether as an addition to an existing laboratory, or as part of a more flexible laboratory, filtered fume hoods adaptability and reliability make them the ideal choice for many laboratory needs and AirClean® Systems is ready to work with. 00 $ 3,040. installation and lowering energy costs. The operating cost is significantly less for ductless units. As for the fume hood you're using, I'd just look at the service manual and find its specs and all of its info. Be sure to use the workbench to support the plate. Laboratory fume hood add-ons include activated carbon filters for removal of non-hazardous, nuisance odors. Between 900 and 1200 CFM, go with 8” duct. Have a second person support the weight of the range hood while you use a screwdriver to loosen the. . Ascent™ Max Ductless Fume Hood with Secondary Backup HEPA Filter, 5ft/1. Negative pressure flow pulls particulates away from the handler while drawing air into the work surface and through the Multiplex™ filter. Downsides. volatile organic compounds, smelly chemicals). They are equipped with integral exhaust blowers and do not require duct or venting to the outside. Airfiltronix. Narrow Down Where. designed for ductless applications, filter the air before returning it to the lab. Ductless Fume Hood is a viable alternative to conventional fume hoods. Cole-Parmer® FHD-200 Series Standard Ductless Fume Hoods. Locate and Mark the Vent Holes. Fume Hoods. Name and Email are required. Ducted fume hoods have ventilated enclosures and operate within the. This is Labconco’s most flexible fume hood. Ductless Fume Hoods, also known as Ductless Containment Hoods or Fume Hoods, are self-contained workstations that help to protect the operator's breathing zone from. 7 inches deep to accommodate any need. Our systems utilize powerful fans combined with a variety of pre-filters, HEPA. And finally, with 1200 CFM or more, install a 10” duct. Gather A List Of Substances You Use. A ductless enclosure is a safety device used to protect laboratory workers when handling chemicals that pose an inhalation risk. Fume hoods remove the fumes as air flows into the hood and then out via the laboratory exhaust system. Fume extractors typically have extractor arms that can be easily positioned to remove fumes or airborne particulates. Labconco Protector Fume Hoods include the XStream, the most energy-efficient ducted fume hood design, as well as other high performance ducted fume hoods in our Premier and XL lines. A S ® 120 6th Street Fort Myers, FL 33907 T/239. Carbon & HEPA filtered enclosures, also known as filtered fume hoods, are ductless laboratory enclosures that remove hazardous fumes, vapors and particles from the laboratory. 5 sones sound level. We manufacture a complete series of high efficiency ductless fume cupboards, ductless workstations, laboratory filtration products, and custom enclosures. 10. 6 m/s. also manufactures fume hoods that include a fan and filtration media (Ductless Fume Hood). All air that flows through these stand alone fume hoods will get recycled back into the laboratory space. 5" / 750mm Nominal Width, FSA Filter Saturation Alarm and AUTOCAL Airflow Display, Requires Minimum One ASTM-XXX Main Filter P10-XT-A-ADVP Purair®ADVANCED Ductless Fume Hood, 29. Warnings are included that manyDuctless Fume Hoods. Ductless Exhaust Fume Hood -- 2900-20. Indoor/Outdoor. Fume hood should u. Continuous airflow across the work surface draws contamination away from the user, recycling clean air back into your laboratory. Height (Metric) 149. Esco Ascent™ Ductless Fume Hoods (ADC) provide the Green solution to modern chemistry by using carbon filters to absorb chemical fumes, henceforth requires no ducting. The Ductless Fume Hood - MID offers all the basic funcionalities, in addition to an air velocity display and alarm. Generally lab hoods are designed to evacuate 100 CFM for every square foot of hood opening. These devices work by using a fan to draw air into a chamber, through one or more filters, and back into the laboratory. One of the questions we often encounter is, whether the choose a traditional ducted fume hood or go for the ductless hoods. 00USD / Each. 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. The operating cost is significantly less for ductless units. A ducted hood, on the other hand, cannot be installed as ductless. This is Labconco’s most flexible fume hood. Labconco Protector Echo and Airo Filtered Fume Hoods are simple to install because they require no ductwork. 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. Ductless fume hoods pass contaminated air through filters before returning air to the room. 00 - $3,415. Name and Email are required. Vesta Arlington Under-Cabinet Range Hood. Labconco™ Paramount™ Ductless Enclosure: 3ft. Ducted hoods typically require a significant volume of airflow to work properly. 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. Downward airflow in the chamber protects the operator. • DFH filter assembly is easy to access, easy to change. If salvaged hoods will be reused, the. A large variety of ducted fume hoods exist. Use. com. Ductless Fume Hood. These enclosures serve as barriers against exposure that could be detrimental to tests or health. Country of Origin: Made in India. 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. In ordinary times, keeping the work area and. With a reliable, durable sensor element, monitor provides simple field calibration. Explore Options. True bag-in/bag-out allows for safe filter replacement and HEPA filter disposal system. Height (Metric) 149. With fume hoods. All HEMCO fume hoods are constructed of a highly corrosion resistant composite resin designed to outlast standard painted metal fume hoods. Most fume hoods are box-like structures with a vertical (most. Erlab are experts in air filtration, protecting the safety of lab personnel for over 50+ years. The. Feature chemical-resistant fiberglass, composite panel liners, Eco-Foil™ air foil and aerodynamic Clean-Sweep™ airflow openings. Benchtop fume hood, depending upon your application, is an economical and compact option to the static fume hoods. 39 products. In most designs, conditioned (i. Fume hoods are built with a safety glass sash that provides a physical barrier, however, it is still glass. Esco Lifesciences offers world-class ducted fume hoods to provide maximum safety and comfort to laboratory. Build a hood with an appropriately sized blower and add a scrubber to remove emissions in need of scrubbing, like NOx, or the Sulfur. Photo: homedepot. 00. 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. Unlike traditional fume hoods, installation costs are very low and no ductwork is required. Mystaire®. Mushroom Clean Air Box DIY Portable Laminar Flow Hood Mycology Fume Hood Propagation Station Monotub - White. Ascent™ Max Ductless Fume Hood with Secondary Backup HEPA Filter, 5ft/1. If you prefer, you may contact us by calling 800-799-4609, or e-mail us at sales@sentryair. Our ductless fume hoods provide energy savings, safety and convenience and are available in a variety of configurations, including mobile fume hoods and polypropylene fume hoods. 10% off your first purchase + Free ShippingHow to Make a Fume Hood Part 1 - Plan and Supplies Science Marshall 21. This high-capacity, turnkey fume hood features dual blowers to ensure a safe exhaust flow speed >/= 100 fpm (. Now that you’ve got. Articulating arms are especially suitable for applications where small, flexible and easy-to-use articulating arms are required to eliminate particles, smoke, gases, and dust. Compare this item. The ductless hood’s scope of use is limited to the capacity and capability of the filtration system. The Air Science filters are easy to access, easy to change. These exhaust hoods are fitted with fans that. Protects the operator from fume and particle hazards. Select Options. Ductless fume hoods recirculate laboratory air after filtering out particulates and fumes, instead of venting contaminants and the large volumes of air containing them. Preparing the Fume Hood for WorkDucted Fume Hoods. Fume Hoods protect laboratory staff from noxious fumes released by acids, dangerous gas, and organic solutions. The final tip concerns the duct size. Fume hoods provide the necessary protection for both the working materials and personnel. Supports wide array. When deciding if you need a ductless fume hood. 8ft COMBO-SASH Hanson USED FUME HOOD W/ CABINETS. The liner is compatible with general chemistry use. 7. com. Fume hoods should not be installed face to face or opposite a biological safety cabinet unless the distance between them is at least 9’ feet. Easily view and access the workspace the clear shield. The first step is to cut the materials to the required size. Hauslane WM-538 Wall Mount. 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. Face velocity: 0. 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. Robust Hood Construction. AscentTM Opti (SPD-_B) Ductless fume hood with transparent back wall ideal for classrooms and educational demonstrations Powdermax® Ductless fume hood with HEPA filter for powder weighing applications ForMax Ductless fume hood specialized as a formalin dispensing unit RotaMax Ductless fume hood designed to accommodate. $489. The self-contained assembly maximizes filter. This cleaner has been specially formulated for use on laboratory surfaces including, stainless steel, stone/composite bench tops and fume hood sashes. Ductless models filter the air releasing it back into the external room. The design of this hood is beautiful and functional, and the buttonless display. A ducted fume hood that requires 500 CFM could cost as much as $4,000 USD per year to operate. The carbon filter is sized to fit the specified product model number and configured to optimize airflow across 100% of the filter surface area. 00 $189. Cole-Parmer® FHD-400 Advanced Ductless Fume Hoods with Filte…. Range hoods are the most effective way to do this, if your range hood actually moves air out of the kitchen. application for ductless fume hoods. 12 microns (ULPA). Due to the great variety of chemicals that might be used in a research setting, it is difficult to predict the effective. Attach the damper with screws. $ 3,528. Ducted fume hood adalah jenis fume hood yang banyak digunakan di laboratorium, fume hood jenis ini bisa langsung dipasang di ruangan laboratorium dengan melubangi dinding laboratorium untuk pemasangan ducting. The final tip concerns the duct size. , due to equipment blocking baffles), indicate as such on the Survey Form and communicate to the Laboratory Manager for correction prior to any retesting. However, with a ductless fume hood, users can create a taller work zone to set up and accommodate taller lab accessories. quickly becoming a viable alternative to conventional fume hoods. These hoods come with a microprocessor control system with an LED display. Polypropylene construction resists chemical vapors, and an onboard air speed meter monitors operation. Do this outside of the cabinet space (in your workshop). Ductless fume hoods, or filtered fume hoods, are self-contained, filtered enclosures that remove hazardous fumes, vapors and particulates from the immediate environment. Ductless fume hoods cut energy bills by filtering and recirculating heated or cooled air back into the laboratory. $517. Have more light with the 1400 Lux LED light with easy operator light and fan adjustments with the AirHawk. Get a Quote. View All 5. We have three types of fume extraction system: Ducted Fume Cupboard, Ductless Fume Hood, and Fume Extractor Arms. The fume hood was a simple build from inexpensive mat. Continuous airflow across the work surface draws contamination away from the user, recycling clean air back into your laboratory. New chemical fume hoods must be equipped with air flow monitoring devices which will alert the user if there is a problem. Turn off the power to the range hood, then unscrew the wire nuts and disconnect the wires. A ductless fume hood can eliminate very high percentages of particulates and biological hazards to protect lab workers and the lab environment. Used. Connect the two by drawing a line from point 1 to 2. 4K subscribers Subscribe 23K views 10 years ago This is the first part in a series of. LCD Touch screen control panel, easy to operate. Begin by unpacking the unit and removing the filter, exhaust fan and electrical housing cover. Topair’s Polypropylene Ductless Fume Hood – PRO with EN and ASHRAE certification provides a safe work environment for lab staff working with acids and harsh chemicals. Aeromech make Fume Exhaust Hood. It is not intended as a disinfectant. Hauslane Chef Series WM-639 Wall Mount Range. Includes hood, fluorescent illuminator, blower module, two. Erlab ductless filtering chemical fume hoods provide the world’s most powerful filtration, guaranteeing safety and performance. Laboratories that handle light to moderate. . Then mount the blower motor with a fan guard on top of the box. Because of the toxic fumes, good ventilatio…. 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. 00. Ductless fume hood means a non-ducted fume hood utilized for the safe removal of low hazard chemical or other nuisance vapors and/or fumes, and is often referred to as a “green” fume hood, and referred to in this. Fume Hoods protect laboratory staff from noxious fumes released by acids, dangerous gas, and organic solutions. Brand: Chemietron. • 2-Speed blower quickly pulls smoke and odors from the air. This type of fume hood utilizes carbon or HEPA filtration to protect laboratory personnel from toxic chemical fumes, odors, and particles. Biosafety Cabinets (26) Clean Benches (1) 1. Introduction Step 1: Precutting/Sizing The Materials. Sentry Air Systems’ OSHA compliant Portable Spray Booths are built with stringent quality control measures and superior craftsmanship. 725 cfm at 0. Available in four configurations and 6 standard sizes, in metal or polypropylene construction, totaling 12 standard models. For ducted fume hoods, ensure that theA hood with missing side panels or cracked sashes will not provide adequate exposure control. A system of endless benefits, providing flawless protection throughout the lab and beyond. Description. 3. Explore Options. . 21. 2. This means that unlike ducted fumeErlab SMART391RT Resin Work Surface for 391 Smart Ductless Fume Hood. Disclaimer: The end user is ultimately responsible for conforming to all applicable exhaust ventilation regulations. Fume Hood. Ductless fume hoods pass contaminated air through filters before returning air to the room. For example, if the laboratories located in the center or bottom of the building, it may not have a ducting option. These hoods can be placed onto fixed work surfaces or on mobile stands. Cole-Parmer FHD-200 Carbon Filter for Acids and Sulfur RK-78900-14. $2,421. Made out of panelized fiberglass, the design allows for wider and deeper standard sizes. Tel: 800-799-4609, or e-mail us at. 00. Ductless Fume Hoods - Negative Pressure - Table Top - Chemical Containment Hood - Workspace: 34"W x 17"D x 17"H AF-G-36. Ductless fume hoods are equipped with a fan to pull in contaminants. A fan on top of the hood draws in fumes and particulates from the chemical process occurring in the hood, a prefilter. Proper maintenance of fume hoods gives you longer protection from hazardous fumes. Known for its plug-and-play feature and mobility, Ductless Fume Hood guarantees a hassle-free installation and no lab work interruption. 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. For ducted fume hoods, ensure that the A hood with missing side panels or cracked sashes will not provide adequate exposure control. The primary purpose of the fume hood is to contain gases, vapors and fumes and then exhaust them out of the area. Ductless fume hoods pass contaminated air through filters before returning air to the room. . Velometer, Continuous Display of Face Velocity, fits all Air Science Ductless Fume Hoods (DWYER) Pricing & Availability 7 Cole-Parmer TEL UK Air Flow Monitor for Fume Hoods, 0 to 1000 fpm Airflow Monitor. Neutrodine® Unisorb Filtration Technology offers comprehensive molecular filtration. The built-in blower exhaust HEPA filter is mounted on the top plenum conserves space. The fume hood design, and any additional features, is dependent on what types of. Obtain information about ductless fume hoods through communication with various professionals 3. Ductless Fume Hoods- Portable. Contact now! Call us (800) 251-1505. 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. These can be gases, vapours, aerosols or particulates (dust). Filter blockage alarm. Either that or be prepared to constantly replace. Air inside the enclosures passes through carbon filters, and in some cases additional HEPA particulate filters, before being safely. Add To Cart. Conduct a literature review of ductless fume hoods in engineering and industrial hygiene journalsDucted Fume Hood. So after being inspired by the countless DIY fume hoods, like this one, he decided to try his hand at it. Reorder Filters;All areas where it has been determined that a fume hood is required and a ductless fume hood is desired. * The case is made of 8mmPP plate, with good finish and corrosion resistance. Fotile 30-Inch Under-Cabinet or Wall-Mount Range Hood. Has small graphics on the touchscreen that may be difficult for some to read. Name and Email are required. 800. These ductless containment hoods are available in 24″, 32″, 48″, 60″, 72. OSHA 29 CFR Part 1910. Introduction. Ductless Fume Hoods (portable fume hood, ductless fume cabinet) provide protection to both laboratory personnel and the environment from toxic fumes and are quickly becoming a viable alternative to conventional fume hoods. Between 600-900 CFM, install 6” duct. 5m, with PP drip-cup provision: Accessories. ** 48″, 60″ and 72″ ductless hoods includes two 1200 CFM blowers and requires two sets of filter. An exhaust fan draws air into the front opening of the hood, then up and out of the hood through the ductwork. All LabGuard fume hoods are type-tested for ASHRAE 110:2016 and EN 14175:2003 performance standards and. Amperage. 17 in. Fume scrubbing is a different matter. Ductless Fume Hoods and Enclosures . Remove vapors and contaminates with many available filters. This is a self-contained work station, also known as a ductless fume hood, that requires no ducting so they it can be moved from lab to lab. This attractive, portable and easy to maintain system is. Draw away harmful acid fumes with the Labconco Protector™ Acid Digestion Hood, a PVC hood with bypass airflow design. Laboratory fume hoods require an exhaust and make-up air system to effectively remove contaminants from the work zone. Ductless Fume Hoods 10 • 10XL • 15 • 20 • 25 • 30 • 40 Standard Control Panel Advanced Control Panel (ADVP) Monitair Control Panel Energy-efficient blowers promote long life and dependable performance of Purair Advanced fume hoods. Description. Brand: Chemietron. About AirClean Systems. Purair Basic ductless fume hoods are found in research laboratories, educational facilities, and forensic laboratories throughout the world and are designed to protect the user and the environment from hazardous vapors generated on the work surface. • Know and check your airflow! For fume hoods, air always goes into the hood, away from the operator. 7 in. Country of Origin: Made in India. Our laboratory fume extractor is widely used in medical research laboratories, chemical. Users need to be able to rely on their fume hood as a primary containment device to protect them from the hazards within. 5) If fume hood appears to have failed certification due to mechanical deficiencies, immediatelyDuctless Fume Hood contains toxic chemical fumes and prevents chemical exposure to ensure the safety of both laboratory personnel and the environment. Tim Campbell: Ducted fume hoods are making your chemical exposure the outside world’s problem by dispersing it to the outside environment. Building a Small Fume Hood for Stinky Projects: My wife Jennifer makes cast-resin jewelry1. Once you’ve got the materials precut and sized, the next step is to cut the edges. A ductless range hood. ”. If there are opposing walls or obstructions, the. Our ductless fume hoods provide energy savings, safety and convenience and are available in a variety of configurations, including mobile fume hoods and polypropylene fume hoods. Diagram. 1. Per ASHRAE 110-2016 a properly working fume hood should have a face velocity between 0. Find My Store. As a vital piece of laboratory equipment, thorough product specifications help you decide which make and model will work best for your. Reply. Unlike traditional fume hoods, installation costs are very low and no ductwork is required. Purair®ADVANCED Ductless Fume Hood, 29. This fume hood box design is perfect for adding more filters. Constant Monitoring of Temperature and Humidity Mystaire® ductless fume hoods are self-contained, filtered enclosures that remove hazardous fumes, vapors and particles from virtually any laboratory application. 3. 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. No installation costs since no ductwork is required. Ductless fume hoods have no place in the reactions side of refining. The Captair Smart 321 ductless fume hood is designed to protect users during applications that emit harmful vapors/chemical particles. 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. 00. List: $189. A very rudimentary comparison is that HEPA is designed to better filter particles (i. • All hoods shall be equipped with a flow indicator, flow alarm or face velocity monitor • Ductless hoods should only be used with non-hazardous material.