The Misonix Aura 250L is a compact ductless laboratory fume hood designed to provide personnel protection during selected chemical handling procedures involving hazardous fumes, vapors, and odors. Available used and refurbished from American Instrument Exchange, this specialized chemical filtration enclosure combines an integrated blower, electronically controlled airflow, and advanced filter monitoring to provide a practical alternative to conventional ducted chemical fume hoods.
Unlike traditional laboratory fume hoods that exhaust contaminated air outside the building, the Misonix Aura 250L uses application-specific filtration to capture compatible chemical contaminants before returning treated air to the laboratory. This recirculating design can simplify installation and reduce the need for expensive building ventilation modifications.
The Aura 250L offered by American Instrument Exchange measures approximately 30" W × 28" D × 48" H and is listed with an airflow capacity of 135 CFM at 125 linear feet per minute. Its compact footprint makes it particularly attractive for analytical chemistry laboratories, pharmaceutical research facilities, educational laboratories, and other environments requiring localized chemical vapor containment.
Key Features
Used and refurbished Misonix Aura 250L ductless fume hood
Compact 30-inch-wide laboratory enclosure
Integrated blower motor included
Ductless, recirculating filtration design
Electronic airflow monitoring and automatic blower adjustment
Digital airflow display
Audible and visual low-airflow alarms
Hydrocarbon vapor breakthrough monitoring
Filter saturation monitoring and replacement alerts
Automatic blower-speed adjustment based on sash position
Filtrak filter-locking system
Electrostatically charged particulate prefilter
Chemically resistant transparent acrylic panels
Powder-coated aluminum construction
Fluorescent work area lighting
Removable fiberglass spill tray
No external exhaust ductwork required for approved applications
Used and reconditioned by American Instrument Exchange
90-day warranty included
Overview of the Misonix Aura 250L
The Misonix Aura 250L belongs to the Aura family of ductless laboratory fume hoods, developed to provide chemical vapor containment through controlled airflow and specialized filtration.
Its compact design is intended for laboratory procedures involving relatively small quantities of compatible chemicals, particularly where conventional ducted ventilation is unavailable or difficult to install.
During operation, the integrated blower draws room air inward through the front access opening. Air containing chemical vapors or airborne contaminants is directed through the enclosure's filtration system before being returned to the surrounding laboratory.
The Aura 250L incorporates electronic monitoring features intended to help operators identify conditions that could compromise safe operation, including insufficient airflow and potential filter breakthrough.
Because ductless containment depends on the selected filtration media, the hood must be matched to the specific chemicals and procedures used in the laboratory.
Ductless Chemical Vapor Filtration
The defining feature of the Misonix Aura 250L is its ductless filtration system.
Rather than relying on external ductwork to remove chemical vapors from the building, the enclosure uses specialized filters to capture compatible contaminants from the exhaust stream.
Misonix Aura systems support activated carbon filtration for selected chemical vapors, including filter media formulated for different chemical classes. HEPA filtration options are also available for particulate applications.
The correct filter must be selected according to the chemicals handled, expected vapor concentrations, quantities used, operating duration, and manufacturer compatibility guidance.
A standard activated carbon filter should not be assumed effective against every solvent, acid, base, or hazardous gas. Some substances may require specially treated carbon, another filtration technology, or a conventional externally exhausted chemical fume hood.
The exact main and safety filters installed in this refurbished Aura 250L should be confirmed before use. The inclusion of an electrostatic prefilter does not establish that a suitable chemical vapor filter is installed.
Integrated Blower and Automatic Airflow Control
The Misonix Aura 250L includes an integrated blower motor that generates the inward airflow necessary for chemical containment.
Unlike conventional ducted laboratory fume hoods, this system does not require a separate rooftop or inline exhaust blower for approved ductless applications.
The Aura's electronic control system monitors operating conditions and adjusts blower performance to help maintain appropriate airflow.
Automatic blower adjustment is particularly useful as the sash position changes or filtration resistance increases during normal operation.
The digital airflow display provides operators with information about system performance, while audible and visual alarms warn of low-airflow conditions.
These features help distinguish the Aura 250L from simpler ductless enclosures that offer limited operating feedback.
Chemical Breakthrough and Filter Saturation Monitoring
One of the most important features of the Aura 250L is its electronic filtration monitoring system.
Misonix Aura enclosures incorporate hydrocarbon vapor sensing intended to detect certain organic vapor breakthrough conditions. The system also provides filter saturation information and alerts to support maintenance decisions.
This monitoring can help operators identify when a filter may no longer be providing the intended protection for compatible monitored vapors.
However, a hydrocarbon sensor cannot be assumed to detect every hazardous chemical. Filter breakthrough may occur with substances that are not adequately detected by the installed sensor.
Laboratories should therefore use manufacturer-recommended filter selection, replacement schedules, and chemical-specific risk assessments rather than relying exclusively on electronic alarms.
Filtrak Filter-Locking System
The Aura filtration system incorporates Misonix's Filtrak filter-locking design.
This system is intended to provide a secure seal around the installed filter, reducing the possibility that contaminated air will bypass the filtration media.
An alarm can alert the operator when the filter-locking mechanism is not properly engaged.
Effective filtration depends on both the suitability of the filter media and the integrity of the filter installation. A poorly seated filter can compromise performance even when the filtration material itself is appropriate for the application.
The Filtrak system provides an additional safeguard by helping identify improper filter installation before or during operation.
Chemical-Resistant Construction and Work Area
The Misonix Aura 250L combines transparent acrylic enclosure panels with powder-coated aluminum structural components.
The transparent panels provide visibility during chemical handling procedures, allowing operators to observe samples, glassware, and instruments without unnecessarily opening the enclosure.
Fluorescent work area lighting improves visibility during sample preparation and routine laboratory procedures.
The Aura family also incorporates a removable fiberglass spill tray designed to help contain incidental spills and facilitate cleaning.
These construction features make the enclosure suitable for consideration in laboratories requiring a compact, enclosed chemical-handling workstation.
Material compatibility should be evaluated for the specific chemicals used, particularly when handling solvents or reagents that may damage acrylic or other enclosure components.
Common Applications
The Misonix Aura 250L can support a variety of laboratory procedures involving small quantities of compatible chemicals.
Potential applications include analytical sample preparation, reagent dispensing, chemical weighing, solvent handling, chromatography sample preparation, pharmaceutical research, environmental testing, and selected educational chemistry procedures.
The enclosure may also be useful for laboratories performing repetitive operations that generate chemical odors or vapors and would otherwise require a dedicated ducted workstation.
Its suitability depends on the chemicals involved, the quantities handled, and the installed filtration system. Applications involving highly toxic substances, large solvent volumes, uncontrolled chemical reactions, or incompatible gases may require an externally exhausted chemical fume hood.
Ideal Laboratory Environments
The Aura 250L is particularly attractive for analytical chemistry laboratories, pharmaceutical research and development facilities, biotechnology laboratories, environmental testing laboratories, industrial quality control departments, and university teaching laboratories.
Its small footprint and ductless configuration may also benefit facilities operating in leased laboratory spaces where installing new exhaust ductwork would be difficult or expensive.
Laboratories with intermittent chemical-handling requirements may find a properly configured ductless enclosure useful when the intended procedures fall within the filtration system's approved operating limits.
Specifications reflect the AIE-listed unit where available. Manufacturer documentation for the broader 30-inch Aura family lists different airflow and exterior-height values; these should be reconciled against the individual unit before publication.
Choosing a Ductless Fume Hood vs. a Conventional Chemical Fume Hood
The primary difference between a ductless chemical fume hood and a conventional ducted fume hood is how contaminated air is managed.
A ducted chemical fume hood captures chemical vapors and exhausts them outside the building through an appropriate ventilation system.
The Misonix Aura 250L instead relies on chemical-specific filtration to remove compatible contaminants before returning air to the laboratory.
This can reduce installation complexity and eliminate the need for dedicated exhaust ductwork. It may also help avoid the energy costs associated with continuously exhausting conditioned laboratory air.
However, ductless operation introduces additional responsibilities involving chemical compatibility, filter selection, filter replacement, and breakthrough monitoring.
A ductless fume hood is not a universal replacement for a conventional chemical fume hood. Laboratories should select the appropriate ventilation equipment based on their chemical inventory and operating procedures.
Installation and Filter Selection
Proper installation of the Aura 250L begins with identifying the chemicals and procedures that will be used inside the enclosure.
The laboratory should confirm that the selected filtration media is appropriate for those substances and that expected vapor concentrations and operating durations fall within the manufacturer's recommended limits.
The enclosure should be positioned away from doors, high-traffic areas, and other sources of disruptive airflow.
Because the blower is integrated, external exhaust ductwork is not required for approved recirculating applications. The laboratory must still provide appropriate electrical service and adequate clearance around the enclosure.
Before hazardous chemical use, the installed filters should be inspected, the airflow and alarm functions verified, and the complete system evaluated under representative operating conditions.
Refurbishment and Testing
This Misonix Aura 250L is used and reconditioned by American Instrument Exchange.
Our technicians inspect the enclosure's structural condition, sash, lighting, blower, controls, and other applicable components as part of the refurbishment process.
The integrated blower and electronic monitoring system are important components of this model and should be evaluated for proper operation.
Because the Aura relies on application-specific filtration, the condition, type, and remaining service life of the installed chemical filters should be confirmed before the enclosure is placed into service.
Final airflow verification and filter suitability assessment should be completed at the installation site.
Shipping and Laboratory Setup
The compact 30-inch configuration makes the Aura 250L relatively easy to incorporate into an existing laboratory layout compared with a larger conventional fume hood.
Before ordering, laboratories should verify the available bench space, supporting surface capacity, electrical requirements, and clearance needed for sash operation and filter servicing.
American Instrument Exchange can assist with equipment information, photographs, and shipping arrangements to help customers plan their installation.
Related Laboratory Equipment
American Instrument Exchange offers a wide selection of refurbished chemical fume hoods for laboratories requiring either ductless filtration or conventional external exhaust.
For procedures involving hazardous powders rather than chemical vapors, laboratories may also consider specialized balance enclosures and particulate containment systems. AIE supplies analytical and precision balances for sample preparation and weighing applications, along with biosafety cabinets and clean benches for other laboratory protection requirements.
Why Buy a Refurbished Misonix Aura 250L from American Instrument Exchange?
Purchasing a refurbished Misonix Aura 250L can provide laboratories with a cost-effective way to add chemical-handling containment without investing in an entirely new ductless fume hood.
The integrated blower, electronic airflow monitoring, hydrocarbon breakthrough sensing, and filter saturation alerts make the Aura 250L an attractive option for laboratories seeking a compact chemical filtration enclosure with advanced operating controls.
American Instrument Exchange specializes in used and refurbished laboratory equipment, helping research, pharmaceutical, industrial, and educational facilities obtain quality equipment at a lower cost than purchasing new.
This Misonix Aura 250L includes a 90-day warranty from American Instrument Exchange.
Frequently Asked Questions
What is the Misonix Aura 250L designed for?
The Aura 250L is a ductless chemical fume hood designed for selected laboratory procedures involving compatible chemical vapors, fumes, and odors. It provides localized personnel protection through controlled inward airflow and application-specific filtration.
Does the Misonix Aura 250L include a blower motor?
Yes. The Aura 250L includes an integrated blower motor that moves air through the enclosure and filtration system. A separate external exhaust blower is not required for approved ductless operation.
Does the Aura 250L require external ductwork?
No. The Aura 250L is designed to operate as a recirculating ductless fume hood when equipped with suitable filtration for the intended chemicals.
Does this hood include carbon filters?
The Aura platform supports application-specific activated carbon and other filter options. However, the exact filters included with this individual refurbished unit should be confirmed with American Instrument Exchange before purchase. A suitable filter must be installed before chemical use.
Can the Aura 250L detect chemical filter breakthrough?
The Aura incorporates a hydrocarbon vapor sensor intended to detect certain organic vapor breakthrough conditions. It should not be assumed capable of detecting every chemical or indicating breakthrough for substances outside its sensing capabilities.
How does the automatic airflow control work?
The electronic control system monitors operating conditions and adjusts blower performance to help maintain appropriate airflow. The enclosure also provides low-airflow alarms to alert operators when performance may be inadequate.
What is the Filtrak filter-locking system?
Filtrak is Misonix's filter-retention system designed to provide a secure seal around the installed filter and reduce the potential for contaminated air to bypass the filtration media.
Can the Aura 250L be used for solvent handling?
Potentially, depending on the solvent, quantities used, and installed filter media. Each intended solvent must be evaluated for compatibility with the filtration system. Some chemicals and procedures are unsuitable for ductless recirculating containment.
Can this enclosure be used for powder weighing?
The Aura family supports filtration configurations for certain particulate applications, including HEPA filtration options. Powder handling requires an appropriate installed filter and verification that the enclosure meets the application's containment requirements.
Is the Aura 250L suitable for highly toxic chemicals?
Not automatically. Suitability depends on the specific chemical, its exposure limits, expected vapor generation, filtration capacity, and manufacturer guidance. Highly toxic or poorly adsorbed chemicals may require an externally exhausted fume hood.
What are the dimensions of the Misonix Aura 250L?
American Instrument Exchange lists this unit at 30 inches wide, 28 inches deep, and 48 inches high. Manufacturer documentation for the 30-inch Aura family gives a 50-inch height, so the individual unit should be measured to confirm installation clearance.
Does this refurbished Misonix Aura 250L include a warranty?
Yes. American Instrument Exchange includes a 90-day warranty with this used and reconditioned Misonix Aura 250L.
Want to see a video of this unit? Click Hereto see the Misonix Aura 250L ductless fume hood on the American Instrument Exchange YouTube channel.
Testing Procedures for Used and Refurbished Laboratory Equipment
Ensure Accuracy, Safety, and Dependable Performance Across Applications
At American Instrument Exchange, all used and refurbished laboratory equipment undergoes a rigorous, multi-point testing protocol to ensure optimal performance, operational safety, and long-term reliability. Whether the equipment is destined for research, diagnostics, quality control, or production environments, our thorough inspection and testing process is designed to meet the highest standards of laboratory excellence.
Why Testing Used Lab Equipment Is Essential
Before any refurbished laboratory equipment is returned to service, it must be carefully tested to verify:
• Functional integrity and operational performance
• Setpoint accuracy and repeatability (where applicable)
• User interface responsiveness and control features
Proper testing reduces the risk of equipment failure, measurement inaccuracies, or user hazards—helping to ensure consistent results in clinical, academic, biotech, and industrial labs.
Our standardized lab equipment testing procedures are tailored to each equipment type, ensuring every unit meets manufacturer specifications and industry benchmarks.
Key Testing Procedures for Refurbished and Used Laboratory Equipment
1. Initial Visual Inspection
• Examine equipment housing for signs of wear, corrosion, or damage
• Check ports, power cords, and exterior components for tampering or deterioration
• Verify that internal and external parts (racks, shelves, connectors, accessories) are present and undamaged
2. Functional Startup and Operational Testing
• Power on the equipment and verify startup diagnostics
• Confirm functionality of displays, buttons, switches, and control panels
• Run basic functions to confirm proper response and behavior under standard operating conditions
3. Testing and Performance Verification
• Test internal sensors or control systems using industry-standard tools
• Perform operational tests to validate accuracy and consistency
• Verify key performance specifications such as temperature control, timing, speed, or measurement outputs, depending on equipment type
4. Mechanical and Electrical System Testing
• Evaluate motors, pumps, fans, or other moving parts for smooth operation
• Inspect and test wiring, relays, fuses, and circuit boards for safety and reliability
• Test power delivery and grounding compliance
5. Safety and Compliance Checks
• Ensure equipment is grounded and insulated to meet laboratory safety standards
• Test alarms, interlocks, emergency stops, or safety shutdown systems if applicable
6. Final Quality Assurance and Documentation
• Perform extended runtime testing
• Document operational logs, testing results, and any repairs or adjustments made
• Complete a final inspection, thorough cleaning, and packaging for delivery
Trusted Quality from American Instrument Exchange
With over 50 years of experience in laboratory equipment refurbishment, American Instrument Exchange is committed to delivering certified, lab-ready instruments backed by expert testing. Our testing protocols ensure that each piece of equipment—regardless of type—is safe, accurate, and dependable from day one.
Whether you're equipping a startup lab or expanding a high-throughput facility, you can count on our refurbished laboratory equipment to perform with precision and reliability.
Refurbishment Protocol for Used Laboratory Equipment from American Instrument Exchange
At American Instrument Exchange, every piece of used laboratory equipment we offer undergoes a multi-step refurbishment process. Whether it's an analytical balance, centrifuge, freezer, oven, or any other essential lab instrument, our goal is to restore each unit to peak performance—ensuring accuracy, safety, and long-term reliability in scientific, clinical, industrial, and academic environments.
Why Choose Refurbished Lab Equipment from American Instrument Exchange?
• Thoroughly tested for performance, precision, and safety
• Backed by a warranty
• A cost-effective alternative to new equipment
• Environmentally sustainable through equipment reuse and waste reduction
• Serviced by expert technicians with decades of laboratory equipment experience
Step-by-Step Refurbishment Protocol
Every instrument and system refurbished at American Instrument Exchange follows a detailed, industry-aligned process:
1. Initial Intake & Inspection
• Complete visual and structural inspection for cosmetic damage, wear, or corrosion
• Mechanical assessment of hinges, seals, fasteners, motors, and moving parts
• Missing components and damaged items are documented for repair or replacement
2. Cleaning and Decontamination
• Full internal and external cleaning using non-abrasive, lab-safe solutions
• Removal of biological, chemical, or particulate contamination
• Disassembly and cleaning of removable parts such as trays, shelves, and filters
3. Mechanical and Electrical Repair
• Replacement or repair of worn or broken mechanical parts
• Evaluation and servicing of control panels, sensors, switches, and displays
• Testing and repair of electrical wiring, fuses, circuit boards, and power supplies
4. Functional System Testing
• Assessment of all major functions specific to the equipment type (e.g., speed, temperature, force, weight, timing)
• Operation of control interfaces, programming menus, and digital displays
• Verification of stabilization time, responsiveness, and user input reliability
5. Testing and Performance Verification
• Testing of internal sensors, controllers, and measurement systems using certified tools
• Multi-point testing to ensure repeatability, accuracy, and performance consistency
• Confirmation of user-defined setpoints, timing sequences, or programmable cycles
6. Safety and Compliance Checks
• Testing of safety interlocks, alarms, and over-limit protection systems (as applicable)
• Electrical safety inspections, including grounding and insulation verification
7. Final Quality Assurance and Documentation
• Full operational testing under simulated lab conditions
• Completion of performance benchmarks, testing results, and repair logs
• Final cleaning and visual inspection
Trust the Experts at American Instrument Exchange
With over 50 years of experience in the laboratory equipment industry, American Instrument Exchange is a trusted leader in high-quality refurbished lab instruments. Our refurbishment protocols ensure that every piece of equipment we sell is lab-ready—offering the precision, performance, and durability your team can count on.
Whether you’re outfitting a new lab or expanding an existing operation, choose American Instrument Exchange for tested, warrantied, and cost-effective laboratory equipment.
Warranty Information
All used equipment sold by American Instrument Exchange is refurbished/reconditioned, tested to meet specifications, cleaned, and comes with a 90-day warranty from the date of shipment unless otherwise specified. New products include a warranty from the manufacturer. Your warranty is only valid if you have paid your invoice. If your invoice is over 30 days old, warranty work will not be performed until your invoice is paid in full. American Instrument Exchange is not liable for any special or consequential damages that result from the use of, or the inability to use, the materials on this site or the performance of the products,
Exceptions include international sales and items that are agreed to be sold with a lesser warranty or items that are agreed to be sold “as is.”
Should there be visible shipping damage to packaging or concealed shipping damage to item(s) supplied, buyer must communicate such damage to the delivering entity or carrier upon receipt first and to American Instrument the same day item is accepted / signed for. Failure to do so voids warranty. Customer decision to involve / procure third party or OEM service other than American Instrument or AIE assigned vendors to resolve in-warranty instrument failure or defect without first placing a service call to American Instrument voids warranty.
Return & Cancellation Policy
American Instrument Exchange will authorize the return of and issue a full refund for any equipment that is not working as represented and could not be replaced or repaired to the customer’s satisfaction by AIE or a representative of AIE during the warranty period. Returns without prior authorization and an RMA number will not be accepted.
Customers are responsible for proper packaging of the equipment and all included accessories. American Instrument will pay for insurance and shipping costs. Non-inventory items bought specifically to fill customer orders may possibly be returned, but on a case by case basis.
Customers who cancel orders after refurbishing has begun or after delivery where there are no equipment performance issues may be subject to a Restocking/Cancellation Fee of 20% or more and responsible for shipping costs for both the delivery and return.
Ongoing and Extended Support Options
American Instrument Exchange is able to provide additional repair and support services outside the warranty terms for most products that sell.
For biosafety cabinets, clean benches, chemical fume hoods, and other clean air products our team at AIE Laboratory Services can provide certifications, repairs, decontaminations, and other services for customers throughout New England, and guidance and limited technical assistance for any customers in the US and Canada for new or refurbished biosafety cabinets purchased from American Instrument Exchange.
For all other products, the repair service team at American Instrument Exchange can provide both field and depot repair evaluations. We can easily schedule and coordinate the pick-up and transportation of your malfunctioning equipment. By offering hourly rates lower than most OEM service providers and eliminating travel time for technicians, we help reduce repair costs. Furthermore, our lab depot repair service minimizes or eliminates scheduling delays. Our experienced service technicians are qualified to restore your equipment to factory specifications.
Yes, all equipment from American Instrument Exchange comes with a warranty. Used/reconditioned/refurbished equipment is tested to make sure it operates to the manufacturer's specifications and comes with a 90-day warranty (unless otherwise noted). New equipment comes with a warranty from the manufacturer.
How do you test and recondition the equipment?
Testing requirements vary across all the equipment categories we sell. Temperature controlled units are tested with NIST traceable probes and data loggers. Gaskets, external housing, glass, handles, controls and control screens are all thoroughly inspected for integrity and functionality. We test all equipment using the manufacturer's parameters and specifications to confirm that the unit operates properly.
How do products ship from American Instrument Exchange?
We can ship products both nationally and internationally using a well-established network of transporters. Smaller items will ship via UPS. Larger equipment will be palletized and shipped either LTL or air-ride, depending on the specific equipment and/or delivery requirements.
Return and order cancellation policy
American Instrument Exchange will accept the return of any product that is not working as represented and could not be replaced or repaired to the customer's satisfaction during the warranty period. Customers who cancel orders after refurbishing has begun will be subject to a cancellation and restocking fee of between 20% and 40%.
Are discounts available for educational or non-profit institutions, or for bulk purchases?
Yes – call or email us today with a list of equipment you're looking for and we can potentially put together a quote that includes a discount.
How does your price matching policy work?
We strive to keep our pricing competitive and reasonable. If you find comparable items for sale at a lower price from other vendors please send us a link and or quote for the item and we'll do our best to match or beat the price.
Can I see the equipment in person before committing to a purchase?
Customers are welcome to make an appointment to view equipment in our warehouse. Given our workload we may not be able to test or clean the equipment prior to your arrival if you have not committed to an order.
1023 Western Avenue is a working warehouse, not a showroom, and customers should dress appropriately and wear closed toe shoes.
Can I ship products that I purchased elsewhere to American Instrument for repair?
Yes – please see our repair services page for more information.
