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Thermo Forma 3920ETO Environmental Chamber with CO₂ Control (Solid Door)
Not every laboratory requires a traditional 37°C cell culture incubator. Many research and quality control applications demand precise environmental conditions across a much broader temperature range while still maintaining elevated carbon dioxide levels. The Thermo Forma 3920ETO Environmental Chamber with CO₂ Control was designed specifically for these applications, combining refrigeration, programmable heating, and optional CO₂ regulation in a large-capacity environmental chamber capable of supporting everything from drug stability studies to insect research and large-scale biological experiments. With an impressive 29 cubic foot (821-liter) chamber, temperatures from 0°C to 60°C, and carbon dioxide control from ambient to 20%, the Thermo Forma 3920 offers exceptional flexibility for laboratories requiring environmental conditions well beyond the capabilities of a conventional CO₂ incubator.
Unlike laboratory incubators intended solely for mammalian cell culture, the Forma 3920 functions as a programmable environmental chamber that can maintain refrigerated, ambient, or elevated temperatures while providing highly uniform airflow throughout the chamber. Thermo's Directed Airflow System distributes conditioned air evenly across every shelf, helping maintain exceptional temperature uniformity even when the chamber is heavily loaded with samples or equipment generating heat. For laboratories performing stability testing, shelf-life studies, environmental simulation, microbiology, entomology, or specialized biological research, the Forma 3920 provides dependable performance in a spacious, walk-in-style cabinet with a heated solid door to minimize condensation. Purchasing a refurbished Thermo Forma 3920 Environmental Chamber with CO₂ Control from American Instrument Exchange provides laboratories with a versatile environmental testing platform at substantial savings compared with purchasing new equipment.
Key Features
Approximately 29 cu. ft. (821 L) chamber capacity
Temperature range from 0°C to 60°C
CO₂ control from ambient to 20%
Refrigerated heating and cooling system
Thermo Scientific Directed Airflow System
Heated solid insulated door
Large programmable environmental chamber
Digital Watlow microprocessor controller
Ramp and soak temperature programming
Over-temperature and under-temperature protection
Adjustable defrost timer
Data logging access ports
Stainless steel chamber interior
Multiple adjustable solid shelves
90-day warranty from American Instrument Exchange
Designed for Environmental Testing and Large-Scale Research
The Thermo Forma 3920 was developed for laboratories requiring controlled environmental conditions over a wide temperature range rather than maintaining a fixed incubation temperature. Its combination of refrigeration, programmable heating, and optional CO₂ control allows researchers to perform studies that cannot be accomplished using a conventional CO₂ incubator.
The chamber's 29 cubic foot capacity accommodates large product loads, oversized samples, environmental testing fixtures, insect colonies, biological specimens, pharmaceutical products, and stability study materials. Researchers can also place low-output laboratory equipment inside the chamber while maintaining controlled environmental conditions throughout extended testing periods.
Because of its flexibility, the Forma 3920 has become a popular environmental chamber for pharmaceutical quality assurance laboratories, biotechnology companies, food science laboratories, agricultural research facilities, and universities requiring reproducible temperature-controlled environments for specialized research.
Common Applications
The Thermo Forma 3920 Environmental Chamber with CO₂ Control is commonly used for:
Its broad operating range allows laboratories to perform both refrigerated and elevated-temperature studies within a single environmental chamber.
Ideal Laboratory Environments
The Thermo Forma 3920 is well suited for pharmaceutical manufacturers, biotechnology companies, university research laboratories, agricultural research facilities, food science laboratories, contract testing organizations, environmental laboratories, and quality assurance departments requiring large-capacity programmable environmental control.
Its spacious chamber makes it particularly valuable for laboratories processing high sample volumes or conducting long-term studies involving large product loads. The heated solid door provides additional insulation while minimizing condensation, making the chamber especially useful in refrigerated applications where clear viewing windows are unnecessary.
Temperature Recovery and Environmental Stability
One of the defining strengths of the Thermo Forma 3920 is its ability to maintain exceptionally uniform temperatures across a very large chamber. Thermo's Directed Airflow System utilizes a positive-pressure supply plenum and negative-pressure return plenum to distribute conditioned air evenly across every shelf rather than simply circulating air from the top of the cabinet. This engineered airflow design promotes rapid temperature recovery following door openings while maintaining excellent chamber uniformity, even when the chamber contains large product loads or equipment generating heat.
Temperature can be programmed anywhere between 0°C and 60°C in 0.1°C increments, while the optional CO₂ control system allows atmospheric conditions to be maintained from ambient levels up to 20% CO₂. Programmable ramp-and-soak functionality further expands the chamber's capabilities by allowing users to automate complex temperature profiles used in stability testing, product qualification, and environmental simulation studies.
Environmental Control for Stability Testing
Unlike conventional laboratory incubators that primarily support cell culture, the Thermo Forma 3920 is engineered for laboratories that require reproducible environmental conditions over extended testing periods. The integrated refrigeration system allows the chamber to maintain temperatures below ambient, while programmable heating supports elevated-temperature studies without sacrificing uniformity.
The heated insulated solid door minimizes condensation during refrigerated operation, helping preserve chamber stability while reducing moisture accumulation around the door seal. Standard access ports simplify installation of data loggers, monitoring probes, and instrumentation cables without compromising chamber performance. Combined with programmable controls, automatic defrost scheduling, and large-capacity shelving, these features make the Forma 3920 an exceptionally versatile environmental chamber for research, quality assurance, and stability testing laboratories.
Sample Storage Recommendations
With an impressive 29 cubic feet (821 liters) of usable chamber capacity, the Thermo Forma 3920ETO Environmental Chamber is designed to accommodate large sample volumes and oversized research materials that would be impractical in a standard laboratory incubator. The spacious interior supports pharmaceutical stability studies, environmental simulation testing, microbiology research, agricultural applications, biological specimens, packaged products, laboratory containers, and environmental monitoring equipment.
Multiple adjustable shelves provide flexibility for organizing samples of varying sizes while maximizing chamber capacity. For the best temperature uniformity, products should be evenly distributed throughout the chamber with sufficient clearance around each shelf to allow unrestricted airflow from the Directed Airflow System. Proper spacing helps maintain consistent environmental conditions across all sample locations while promoting rapid recovery following door openings.
Laboratories performing long-term stability studies often dedicate individual shelves or chamber sections to specific projects or testing intervals. Organizing samples in this manner simplifies retrieval, minimizes unnecessary chamber access, and helps preserve stable environmental conditions throughout extended testing protocols.
Energy Efficiency and Operating Costs
The Thermo Forma 3920ETO was engineered for continuous operation in demanding laboratory environments where dependable environmental control is essential. Its integrated refrigeration and heating systems work together under microprocessor control to efficiently maintain programmed conditions across a wide operating range without requiring multiple specialized chambers.
The insulated solid door helps reduce heat transfer during refrigerated operation while minimizing condensation and improving overall thermal efficiency. By limiting environmental losses when the chamber is closed, the insulated cabinet design supports more consistent temperature control during long-term testing.
The programmable Watlow controller allows laboratories to automate temperature changes using ramp-and-soak profiles, eliminating the need for manual intervention during multi-stage testing protocols. Combined with adjustable defrost scheduling and efficient airflow management, these features help reduce day-to-day operating effort while maintaining reliable environmental performance for extended research studies.
Key Specifications
Specification
Details
Manufacturer
Thermo Forma
Model
3920ETO Environmental Chamber
Chamber Type
Refrigerated Environmental Chamber with CO₂ Control
Chamber Capacity
Approximately 821 L (29 cu. ft.)
Temperature Range
0°C to 60°C
Temperature Resolution
0.1°C
CO₂ Range
Ambient to 20%
Air Distribution
Directed Airflow System
Controller
Digital Watlow Microprocessor
Programming
Ramp and Soak Temperature Profiles
Door Type
Heated Solid Insulated Door
Chamber Material
Stainless Steel
Shelving
Multiple Adjustable Solid Shelves
Interior Dimensions
Approximately 30" W × 28" D × 60" H
Exterior Dimensions
Approximately 38" W × 36" D × 78" H
Access Ports
Standard Instrumentation Ports
Safety Features
Over-Temperature and Under-Temperature Protection
Defrost
Adjustable Automatic Defrost
Electrical Requirements
115 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
How is the Thermo Forma 3920ETO different from a standard CO₂ incubator?
Unlike a conventional 37°C incubator designed primarily for mammalian cell culture, the 3920ETO is a programmable environmental chamber capable of maintaining temperatures from 0°C to 60°C while optionally controlling carbon dioxide concentrations. This allows it to support a much wider variety of research and testing applications.
What types of laboratories typically use this chamber?
The 3920ETO is commonly found in pharmaceutical quality assurance laboratories, biotechnology companies, universities, agricultural research facilities, food science laboratories, environmental testing laboratories, and contract research organizations performing stability studies or controlled environmental testing.
What is the advantage of Thermo's Directed Airflow System?
The Directed Airflow System distributes conditioned air evenly throughout the chamber using engineered supply and return plenums. This design helps maintain excellent temperature uniformity across all shelves while promoting rapid recovery after routine door openings.
Can the chamber perform refrigerated and elevated-temperature studies?
Yes. The integrated refrigeration and heating systems allow the chamber to maintain stable temperatures from 0°C through 60°C, making it suitable for refrigerated storage studies, ambient testing, and elevated-temperature qualification protocols within a single unit.
What does ramp-and-soak programming allow users to do?
Ramp-and-soak programming enables the controller to automatically change chamber temperatures over time according to user-defined testing profiles. This feature is particularly valuable for product qualification, environmental simulation, accelerated aging studies, and pharmaceutical stability testing.
Is the solid door an advantage?
For many laboratories, yes. The insulated solid door improves thermal efficiency, minimizes condensation during refrigerated operation, and helps maintain stable environmental conditions. Laboratories that do not require visual observation of samples often prefer a solid door for its insulation benefits.
What types of materials can be placed inside the chamber?
The large interior accommodates pharmaceutical products, biological samples, microbiology media, environmental monitoring equipment, packaged products, laboratory containers, agricultural specimens, and other materials requiring precisely controlled environmental conditions.
Why purchase a refurbished Thermo Forma 3920ETO Environmental Chamber from American Instrument Exchange?
Purchasing a refurbished Thermo Forma 3920ETO from American Instrument Exchange provides laboratories with a large-capacity programmable environmental chamber capable of refrigerated operation, elevated-temperature testing, and optional CO₂ control at substantial savings compared with purchasing new equipment. Every chamber is inspected and tested prior to shipment and includes a 90-day warranty, making it an excellent solution for pharmaceutical, biotechnology, quality assurance, and research laboratories requiring dependable environmental control.
Testing Procedures for Used and Refurbished CO₂ Laboratory Incubators Ensure Atmosphere Control, Temperature Accuracy, and Regulatory Compliance
At American Instrument Exchange, all used and refurbished CO₂ incubators undergo a multi-step testing and calibration process. These procedures are designed to ensure precise environmental control, microbial safety, and long-term reliability—critical for cell culture, IVF, tissue engineering, and pharmaceutical R&D applications.
Why Testing Used CO₂ Incubators Is Essential
Before a CO₂ incubator is redeployed into a laboratory, it must be thoroughly tested for:
• CO₂ sensor accuracy and gas concentration control
• Temperature uniformity and stability
• Humidity system function
• HEPA filtration and contamination control
• Electrical and safety compliance
Proper testing ensures viable growth environments for sensitive cultures and prevents costly contamination or culture loss in high-stakes lab environments.
Our standardized refurbishment protocol ensures used CO₂ incubators deliver laboratory grade performance at a fraction of the cost of comparable new units.
Key Testing Procedures for Refurbished and Used CO₂ Incubators
1. Initial Visual Inspection
• Inspect the exterior for corrosion, dents, or door alignment issues
• Check door gasket integrity and hinge function
• Verify presence and condition of internal shelves, water pans, and humidity trays
• Examine power cords, gas connectors, and display interfaces for signs of wear
2. Functional Startup Test
• Power on the unit and check for successful system boot
• Verify touchscreen or keypad response, and test all user-programmable settings
• Check door alarms and temperature/CO₂ alerts
3. Temperature Control and Uniformity Testing
• Use temperature probes to verify internal temperature accuracy
• Monitor temperature uniformity across multiple chamber zones
• Ensure fast recovery times after door openings
4. CO₂ Sensor Testing and Gas Delivery System Test
• Test accuracy of infrared (IR) or thermal conductivity (TC) CO₂ sensors using certified reference gas and probes/Fyrite analyzers
• Test inlet pressure regulators and gas flow control systems
• Confirm stable CO₂ levels at multiple setpoints (e.g., 5%, 10%)
• Check for proper mixing and diffusion throughout the chamber
5. Humidity and Contamination Control Testing
• Test humidity generation (via water pan or active system) and verify chamber RH levels
• Inspect HEPA filters (if equipped) and airflow systems for particulate control
• Sanitize interior and confirm antimicrobial coatings or copper components are intact
6. Electrical Safety and Compliance Check
• Ensure proper grounding and insulation of all electrical components
• Perform leak and continuity testing
• Verify the unit meets electrical safety standards for laboratory environments
7. Final Quality Assurance and Performance Validation
• Run a 24-hour performance cycle with monitored CO₂, temperature, and RH
• Document data and final readings
• Complete service report
All refurbished CO₂ incubators sold by American Instrument Exchange are tested to meet the performance demands of today's advanced laboratory workflows—ensuring safety, precision, and peace of mind with every unit.
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.
