All products ship from our 30,000 sq. ft. Haverhill, MA warehouse
Thermo Forma 3920 Environmental Chamber
Not every laboratory requires CO₂ control or humidity regulation. Many research, quality assurance, and product development applications simply demand highly accurate temperature control across a wide operating range with exceptional uniformity and recovery. The Thermo Forma 3920 Environmental Chamber was designed for these applications, providing a spacious 29 cubic foot (821-liter) refrigerated chamber capable of maintaining temperatures from 0°C to 60°C with outstanding stability. Its combination of programmable temperature control, directed airflow, and large-capacity interior makes it an excellent choice for environmental testing, pharmaceutical stability studies, biological research, and long-term product evaluation.
Unlike environmental chambers designed for humidity or atmospheric control, the Thermo Forma 3920 focuses exclusively on precise temperature management. The chamber's refrigeration system allows reliable operation below ambient laboratory temperatures, while the programmable ramp-and-soak controller enables users to create complex thermal profiles for demanding testing protocols. Whether evaluating pharmaceutical products, packaged goods, microbiological samples, or research materials, the Forma 3920 provides dependable environmental control for laboratories requiring reproducible test conditions.
Key Features
Approximately 29 cu. ft. (821 L) chamber capacity
Temperature range from 0°C to 60°C
Refrigerated heating and cooling system
Directed Airflow System for excellent temperature uniformity
Programmable ramp-and-soak temperature controller
Heated solid door to reduce condensation
Digital microprocessor controls
Adjustable defrost timer
Standard access ports for probes and data logging
Stainless steel chamber interior
Multiple adjustable shelf positions
Audible and visual over-temperature alarms
90-day warranty from American Instrument Exchange
Designed for Temperature-Controlled Testing
The Thermo Forma 3920 was developed for laboratories that require precise environmental control without the additional complexity of humidity or CO₂ regulation. Its broad operating range and programmable controls allow researchers to simulate storage conditions, evaluate product stability, and conduct biological studies under carefully controlled temperatures.
The large chamber accommodates substantial product loads while maintaining excellent temperature uniformity across every shelf. Laboratories can perform long-duration studies involving packaged products, pharmaceuticals, microbiological samples, insects, plant materials, and research specimens without sacrificing environmental consistency. The spacious interior also allows users to install monitoring devices, data loggers, or specialized research fixtures through the integrated access ports without disrupting chamber performance.
Common Applications
The Thermo Forma 3920 is commonly used for:
Pharmaceutical stability testing
Drug development
Shelf-life studies
Product aging evaluations
Package testing
Microbiological incubation
Insect and entomology research
Seed germination studies
Plant research
Environmental simulation
Quality assurance testing
University research
Industrial product testing
Long-term biological studies
Its combination of refrigeration and programmable temperature control makes the chamber suitable for applications requiring highly repeatable environmental conditions across extended testing periods.
Ideal Laboratory Environments
The Thermo Forma 3920 is commonly found in pharmaceutical laboratories, biotechnology companies, universities, food and beverage quality control facilities, packaging development laboratories, contract testing organizations, agricultural research centers, and industrial research facilities.
Because the chamber provides reliable refrigerated operation together with programmable temperature profiles, it is particularly valuable for laboratories performing stability studies, environmental simulations, and regulatory testing where accurate temperature control is essential.
Temperature Recovery and Environmental Stability
The Thermo Forma 3920 utilizes Thermo Scientific's Directed Airflow System, incorporating positive-pressure supply and negative-pressure return plenums that distribute conditioned air evenly across every shelf. Rather than relying on simple top-mounted airflow, this design promotes excellent temperature uniformity and rapid recovery following routine door openings or the introduction of large sample loads.
Operating across a temperature range of 0°C to 60°C, the chamber supports refrigerated conditioning, ambient storage, and elevated-temperature testing within a single platform. The programmable ramp-and-soak controller enables users to create complex thermal profiles for environmental simulation, accelerated aging, or product qualification studies, while integrated refrigeration maintains reliable performance below ambient laboratory temperatures.
Precision Environmental Control
The Forma 3920 focuses on delivering consistent temperature performance without incorporating humidity or atmospheric controls. This streamlined design makes the chamber particularly well suited for applications where temperature is the primary test variable, reducing operational complexity while maintaining excellent environmental stability.
A heated solid door minimizes condensation during refrigerated operation, while programmable defrost cycles help maintain efficient cooling performance over extended testing periods. Standard access ports allow researchers to introduce probes, thermocouples, or data logging equipment without compromising the chamber environment, supporting comprehensive monitoring during long-duration studies.
Sample Storage Recommendations
With approximately 29 cubic feet (821 liters) of usable chamber space, the Thermo Forma 3920 is designed to accommodate a wide variety of research materials, quality control samples, and products undergoing environmental testing. The large interior provides ample room for packaged products, pharmaceutical samples, microbiological media, laboratory glassware, seed trays, plant materials, environmental monitoring equipment, and custom test fixtures used during long-term studies.
The adjustable shelving system allows laboratories to configure the chamber for both small sample batches and high-volume testing programs. To promote consistent temperature performance, samples should be arranged to allow unrestricted airflow throughout the chamber. Avoid tightly packing shelves or placing oversized items directly against the chamber walls, as proper air circulation helps maintain excellent temperature uniformity across every shelf level.
For laboratories conducting stability studies or product qualification testing, organizing samples by lot number, collection date, or testing interval can simplify retrieval while reducing unnecessary door openings. This practice helps preserve chamber stability throughout extended test cycles.
Energy Efficiency and Operating Costs
The Thermo Forma 3920 was engineered for laboratories requiring dependable environmental control during continuous operation. Its insulated cabinet construction, efficient refrigeration system, and electronic temperature controls work together to maintain stable chamber conditions while minimizing unnecessary energy consumption.
The Directed Airflow System distributes conditioned air evenly throughout the chamber, reducing temperature variation without requiring excessive fan operation. Combined with the heated solid door, this design helps minimize condensation during refrigerated operation while improving overall thermal efficiency.
The programmable ramp-and-soak controller also contributes to efficient laboratory operation by automatically managing temperature transitions during multi-stage testing protocols. Rather than requiring manual intervention, researchers can program complete thermal profiles in advance, improving workflow efficiency while supporting repeatable testing procedures.
Key Specifications
Specification
Details
Manufacturer
Thermo Forma
Model
3920
Chamber Type
Refrigerated Environmental Chamber
Chamber Capacity
Approximately 821 L (29 cu. ft.)
Temperature Range
0°C to 60°C
Cooling System
Compressor Refrigeration
Heating System
Electric Heating
Airflow System
Directed Airflow Plenum
Controller
Programmable Ramp-and-Soak Controller
Chamber Material
Stainless Steel
Door
Heated Solid Door
Shelving
Adjustable Stainless Steel Shelves
Access Ports
Standard Probe Access Ports
Defrost
Programmable Automatic Defrost
Alarm System
Audible and Visual
Interior Dimensions
Approximately 38" W × 28" D × 54" H
Exterior Dimensions
Approximately 48" W × 36" D × 78" H
Electrical Requirements
230 V
Approximate Weight
Approximately 650 lb
Specifications are believed to be accurate but may vary depending on factory-installed options. Please verify all specifications prior to purchase.
Frequently Asked Questions
What is the primary purpose of the Thermo Forma 3920 Environmental Chamber?
The Thermo Forma 3920 is designed for applications requiring precise temperature control over an extended period. It is commonly used for stability testing, environmental simulation, product qualification, pharmaceutical research, microbiological studies, and other laboratory applications where consistent temperature conditions are critical.
Does this chamber provide CO₂ or humidity control?
No. This version of the Thermo Forma 3920 is a temperature-controlled environmental chamber and does not include CO₂ regulation or active humidity control. Laboratories requiring controlled atmospheric conditions should consider a dedicated CO₂ incubator or an environmental chamber specifically equipped with humidity control.
What is the advantage of the programmable ramp-and-soak controller?
The ramp-and-soak controller allows users to create automated temperature profiles that gradually transition between multiple setpoints over time. This capability is valuable for accelerated aging studies, environmental simulation, product qualification, and other testing protocols requiring repeatable temperature changes.
Can the chamber operate below ambient laboratory temperature?
Yes. The integrated refrigeration system allows the chamber to maintain temperatures as low as 0°C, making it suitable for refrigerated storage studies, cold conditioning, and environmental testing applications that cannot be performed in standard laboratory incubators.
What types of samples are commonly tested in the Forma 3920?
Laboratories commonly use the chamber for pharmaceutical products, packaged goods, microbiological media, agricultural samples, plant materials, environmental monitoring equipment, laboratory reagents, and industrial components undergoing temperature qualification or stability testing.
Why is directed airflow important?
The Directed Airflow System promotes uniform air circulation throughout the chamber, helping maintain consistent temperatures across every shelf while supporting rapid recovery after routine door openings. This uniformity improves test reproducibility, particularly during long-duration environmental studies.
Is the Thermo Forma 3920 suitable for regulated quality assurance laboratories?
Yes. The chamber's programmable controls, stable temperature performance, alarm system, and probe access ports make it well suited for quality assurance, validation, and regulatory testing environments where consistent environmental control and data collection are important.
Why purchase a refurbished Thermo Forma 3920 from American Instrument Exchange?
Purchasing a refurbished Thermo Forma 3920 from American Instrument Exchange provides laboratories with a dependable large-capacity environmental chamber at substantial savings compared with buying new equipment. Every chamber is inspected and tested prior to shipment and includes a 90-day warranty, providing confidence that it is ready to support demanding research, quality control, and environmental testing applications.
CLICK HERE to see the Thermo Forma 3920 Refrigerated Incubator on our YouTube channel
Testing Procedures for Used and Refurbished Laboratory Incubators Ensure Quality and Stability Before Use
Used and refurbished laboratory incubators from American Instrument Exchange are thoroughly tested to ensure optimal performance and temperature stability with laboratory safety standards. Each unit undergoes a detailed inspection and functionality assessment to meet the needs of research, clinical, and industrial labs.
Why Testing Used Laboratory Incubators Is Essential
Before a laboratory incubator is reintroduced into any work environment, it must be tested for:
• Temperature uniformity and accuracy
• Airflow and humidity control (if applicable)
• Door seal integrity and insulation effectiveness
• Electrical and safety system compliance
Comprehensive testing reduces the risk of culture loss, contamination, and equipment failure—especially critical in applications involving cell culture, microbiology, pharmaceutical research, and diagnostics.
Our multi-point testing protocol for used and refurbished incubators ensures reliability, safety, and performance across all models and brands.
Key Testing Procedures for Refurbished and Used Laboratory Incubators
1. Initial Visual Inspection
• Check for cosmetic damage, corrosion, and wear to exterior surfaces, door hinges, and gasket seals
• Inspect power cord, wiring, and display panel for any defects or signs of tampering
• Confirm that shelves, chamber components, and internal fixtures are present and undamaged
2. Functional Testing
• Power on the incubator and verify all display indicators and alarms function correctly
• Test door latch and seal mechanisms for proper closure and insulation
• Run basic temperature cycles to ensure the unit maintains stability over time
3. Temperature Accuracy and Uniformity Tests
• Test internal sensors and controllers using temperature probes
• Measure temperature consistency at multiple chamber locations over several hours
• Confirm that programmable temperature settings respond accurately
4. Airflow and Humidity Control (if applicable)
• Test internal fan operation and airflow distribution
• For humidified incubators, inspect and test humidity reservoirs, sensors, and control systems
• Check for condensation buildup and confirm environmental stability
5. Electrical Safety and Compliance Checks
• Ensure all electrical components are properly grounded
• Perform insulation resistance and leakage current tests
• Verify compliance with current electrical safety standards for laboratory equipment
6. Final Quality Assurance Checklist
• Perform full cycle testing at various temperature setpoints
• Document performance benchmarks and results
All refurbished incubators from American Instrument Exchange are backed by our commitment to quality and precision. With our strict testing procedures, you can rely on your incubator to deliver dependable results from day one.
Repair and Refurbishment Protocol for Used Laboratory Incubators Performance and Quality from American Instrument Exchange
At American Instrument Exchange, every used laboratory incubator we sell goes through a repair and refurbishment protocol. Whether it’s a standard, CO₂, or refrigerated incubator, our goal is to restore each unit to laboratory-level performance—ensuring temperature accuracy, environmental stability, and long-term reliability in your lab.
Why Choose a Refurbished Laboratory Incubator from American Instrument Exchange?
• Fully tested for performance and safety
• Backed by a warranty
• Cost-effective alternative to new equipment
• Environmentally sustainable through reuse and restoration
• Refurbished by expert technicians with decades of lab equipment experience
Step-by-Step Refurbishment Protocol
Every incubator at American Instrument Exchange follows this comprehensive, multi-stage process:
1. Initial Intake & Inspection
• Visual inspection for cosmetic wear, corrosion, dents, or broken components
• Mechanical assessment of door hinges, gaskets, seals, and chamber components
• Document any missing parts or issues requiring repair or replacement
2. Cleaning and Decontamination
• Thorough internal and external cleaning using non-abrasive solutions
• Decontamination/cleaning of surfaces to remove biological, chemical, or particulate residue
• Cleaning of removable parts (e.g., shelves, trays, etc.)
3. Mechanical and Electrical Repair
• Repair or replacement of worn mechanical components such as door latches, fans, hinges, and seals
• Evaluation and repair of control panels, switches, thermostats, and displays
• Inspection and testing of wiring, fuses, relays, and power supplies
4. Environmental Control System Assessment
• For CO₂ incubators: CO₂ sensors, regulators, and gas delivery systems are tested
• For refrigerated incubators: compressors, condensers, and cooling systems are evaluated for performance and leaks
• Fan motors and airflow systems are tested to ensure uniform environmental conditions
5. Temperature and Sensor Testing
• All temperature sensors and controllers are tested using thermometers/probes
• Uniformity and accuracy tested at multiple chamber locations
• For humidified or CO₂ incubators, humidity and CO₂ stability are verified
6. Safety System Testing
• Test of over-temperature protection systems and alarms
• Evaluation of door sensors, safety interlocks, and power failure recovery
7. Final Quality Control and Documentation
• Full performance test run over 24 hours
• Validation of setpoints for temperature, CO₂ (if applicable), and humidity (if applicable)
• Final inspection and cleaning before packaging
• Complete service report
Trust the Experts at American Instrument Exchange
With over 50 years in the lab equipment industry, American Instrument Exchange is a trusted source for high-quality refurbished laboratory incubators. Our proven refurbishment protocol ensures every unit is reliable, accurate, and ready to meet the demands of your lab from day one.
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.
