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Thermo Forma 3950 Large Capacity Reach-In CO₂ Incubator
As cell culture operations grow, standard benchtop CO₂ incubators often become limiting. Large tissue culture programs, production laboratories, and core research facilities require substantially greater incubation capacity while maintaining the precise environmental conditions necessary for healthy cell growth. The Thermo Forma 3950 Large Capacity Reach-In CO₂ Incubator was engineered specifically for these high-throughput applications, combining a spacious 29 cubic foot (821-liter) chamber with accurate CO₂ regulation, excellent temperature uniformity, and a robust reach-in design that accommodates large culture systems and laboratory equipment.
Designed for laboratories processing hundreds of culture vessels simultaneously, the Forma 3950 provides stable temperature control, programmable humidity management, and Thermo's Directed Airflow system to create uniform incubation conditions throughout the chamber. The incubator easily accommodates roller bottle apparatus, large shaker platforms, bioreactors, stacked culture vessels, and high-density shelving configurations that exceed the capacity of conventional floor-standing CO₂ incubators. Purchasing a refurbished Thermo Forma 3950 from American Instrument Exchange provides laboratories with production-scale incubation capability while significantly reducing capital equipment costs.
Key Features
Approximately 29 cu. ft. (821 L) chamber capacity
CO₂ concentration range from 0% to 20%
Thermal conductivity (TC) CO₂ sensor
Directed Airflow system
Heated solid outer door
Heavy-duty stainless steel chamber
Triple-pane heated inner glass door
Three humidity operating modes
Automatic, semi-automatic, or manual water fill options
Up to 27 adjustable shelf positions
Interior and exterior accessory outlets
Dual side access ports
Audible and visual alarm system
Remote alarm contacts
Locking swivel casters
90-day warranty from American Instrument Exchange
Designed for High-Throughput Cell Culture
The Thermo Forma 3950 was developed for laboratories where incubation capacity directly affects productivity. Rather than operating multiple smaller incubators across several rooms, researchers can consolidate large culture volumes into a single controlled environment while maintaining excellent temperature and CO₂ uniformity.
Its expansive interior supports everything from traditional tissue culture flasks and multiwell plates to roller bottle systems, orbital shakers, bioreactors, and custom research equipment. With up to 27 adjustable shelf positions and more than 145 square feet of potential shelf area, laboratories can configure the chamber to maximize usable incubation space for virtually any workflow.
The Forma 3950 is commonly found in biotechnology companies, pharmaceutical manufacturing facilities, vaccine development laboratories, university core facilities, contract research organizations (CROs), and cell therapy research centers where reliable, large-capacity incubation is essential to daily operations.
Many laboratories pair the Forma 3950 with biosafety cabinets, refrigerated centrifuges, laboratory refrigerators, ultra-low temperature freezers, and automated cell processing equipment to create integrated production workflows capable of supporting high sample throughput.
Common Applications
The Thermo Forma 3950 is commonly used for:
Mammalian cell culture
Large-scale tissue culture
Cell therapy research
Vaccine development
Monoclonal antibody production
Stem cell expansion
Hybridoma culture
Biopharmaceutical manufacturing
Clinical research
Large-volume microbiology
Contract research
University core laboratories
Biotechnology production
Process development
Its combination of large chamber capacity and precise environmental control makes it particularly valuable for laboratories scaling from research into pilot production or routine manufacturing support.
Ideal Laboratory Environments
The Thermo Forma 3950 is well suited for pharmaceutical manufacturers, biotechnology companies, academic research institutions, contract development and manufacturing organizations (CDMOs), government laboratories, and industrial research facilities.
Because the chamber accommodates large equipment such as shaker platforms and bioreactors while maintaining excellent environmental uniformity, it is especially valuable in laboratories where multiple investigators share incubation space or where production-scale cell culture requires centralized environmental control.
Temperature Recovery and Environmental Stability
Large-capacity incubators must maintain stable conditions across a significantly larger workspace than conventional laboratory incubators. The Thermo Forma 3950 addresses this challenge through its Directed Airflow system, which distributes conditioned air uniformly throughout the chamber to improve temperature consistency and accelerate recovery after door openings. Unlike conventional airflow systems, this design minimizes localized temperature variation while reducing product desiccation during extended incubation periods.
The incubator maintains temperatures suitable for routine mammalian cell culture while accurately regulating CO₂ concentrations from 0% to 20% using a reliable thermal conductivity (TC) sensor. Three selectable humidity operating modes and multiple water-fill options allow laboratories to balance humidity performance with operational convenience based on their individual workflow requirements.
Environmental Control for Production-Scale Cell Culture
The Forma 3950 incorporates several features that support consistent environmental conditions during continuous operation. A heated door assembly helps minimize condensation, while the insulated cabinet reduces heat transfer from the surrounding laboratory environment. Two through-wall access ports allow researchers to introduce probes, sensors, or power cables without leaving the door open, helping preserve stable incubation conditions throughout long-term experiments. Standard remote alarm contacts and optional data outputs also simplify integration with laboratory monitoring systems, making the incubator well suited for regulated research and production environments.
Sample Storage Recommendations
With approximately 29 cubic feet (821 liters) of usable chamber space, the Thermo Forma 3950 is designed to support laboratories that routinely incubate large numbers of cell culture vessels and production-scale biological samples. The spacious interior accommodates T-flasks, roller bottles, multiwell plates, spinner flasks, cell factories, culture bags, bioreactor accessories, and compatible shaker platforms, allowing researchers to configure the chamber for a wide variety of cell culture workflows.
The incubator offers up to 27 adjustable shelf positions, making it easy to customize the chamber for different vessel heights and production requirements. Maintaining adequate spacing between shelves and avoiding obstruction of the directed airflow system helps promote uniform temperature and CO₂ distribution throughout the cabinet, particularly when operating with large sample loads.
For multi-user laboratories or production environments, organizing cultures by project, production batch, or investigator can simplify sample retrieval while minimizing unnecessary door openings. Reducing the frequency and duration of door openings helps maintain environmental stability and supports more consistent incubation conditions during long-term cell culture experiments.
Energy Efficiency and Operating Costs
The Thermo Forma 3950 was engineered for continuous operation in research and production laboratories where large incubators often remain in service around the clock. Its insulated cabinet construction, efficient heating system, and Directed Airflow technology work together to maintain stable environmental conditions while minimizing unnecessary energy consumption.
The heated door assembly reduces condensation without requiring excessive heating, while multiple humidity operating modes allow laboratories to select the level of humidity management appropriate for their application. Depending on workflow requirements, users can choose automatic, semi-automatic, or manual water-fill operation, helping balance convenience with water usage and routine maintenance.
Because the Forma 3950 can replace several smaller CO₂ incubators, many laboratories also benefit from simplified maintenance schedules, fewer calibration procedures, and more centralized environmental monitoring. Consolidating incubation capacity into a single large chamber can improve operational efficiency while reducing overall equipment footprint.
Key Specifications
Specification
Details
Manufacturer
Thermo Forma
Model
3950
Incubator Type
Large Capacity Reach-In CO₂ Incubator
Chamber Capacity
Approximately 821 L (29 cu. ft.)
Chamber Material
Stainless Steel
CO₂ Range
0% to 20%
CO₂ Sensor
Thermal Conductivity (TC)
Heating System
Electric Heating
Airflow System
Directed Airflow
Humidity Control
Three Selectable Operating Modes
Water Fill
Automatic, Semi-Automatic, or Manual
Door Configuration
Heated Solid Outer Door with Heated Triple-Pane Inner Glass Door
Shelf Positions
Up to 27
Access Ports
Dual Side Access Ports
Interior Power Outlets
Yes
Exterior Accessory Outlet
Yes
Alarm System
Audible, Visual, and Remote Alarm Contacts
Mobility
Locking Swivel Casters
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 700 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 makes the Thermo Forma 3950 different from a standard CO₂ incubator?
The Forma 3950 is a large-capacity reach-in incubator designed for high-throughput laboratories. Its 821-liter chamber accommodates substantially more cultures than conventional floor-standing CO₂ incubators and is capable of supporting large research or production workflows.
Can the Forma 3950 accommodate shaker platforms or large culture systems?
Yes. The spacious chamber is designed to support large laboratory accessories including compatible shaker platforms, roller bottle systems, cell factories, and other equipment that may not fit inside standard CO₂ incubators. This flexibility makes the incubator well suited for pilot-scale research and process development.
Why does this incubator use a thermal conductivity (TC) CO₂ sensor?
Thermal conductivity sensors provide dependable CO₂ measurement for routine cell culture applications and are well suited for incubators that operate continuously under stable environmental conditions. Many laboratories choose TC sensors because of their reliability, straightforward operation, and lower long-term maintenance requirements.
What are the three humidity operating modes?
The Forma 3950 allows laboratories to select different humidity operating modes depending on the application's evaporation control requirements and operational preferences. Multiple water-fill options provide flexibility for laboratories with varying workflow demands and maintenance schedules.
Why is a heated triple-pane inner glass door important?
The heated inner glass door helps minimize condensation while allowing researchers to view cultures without exposing the entire chamber to ambient laboratory conditions. This design improves environmental stability by reducing unnecessary heat and CO₂ loss during routine sample inspection.
Is the Thermo Forma 3950 appropriate for production-scale cell culture?
Yes. The incubator was developed specifically for laboratories requiring large incubation capacity for applications such as vaccine development, monoclonal antibody production, stem cell expansion, biopharmaceutical process development, and other high-volume cell culture workflows.
Can the Forma 3950 be integrated into laboratory monitoring systems?
Yes. The incubator includes remote alarm contacts and accessory connections that allow integration with facility monitoring systems and external instrumentation, making it suitable for regulated laboratory environments where continuous equipment monitoring is important.
Why purchase a refurbished Thermo Forma 3950 from American Instrument Exchange?
Purchasing a refurbished Thermo Forma 3950 from American Instrument Exchange provides laboratories with production-scale CO₂ incubation capacity at substantial savings compared with buying new equipment. Every incubator is inspected and tested prior to shipment and includes a 90-day warranty, providing confidence that it is ready to support demanding laboratory research and manufacturing applications.
CLICK HERE to see the Thermo Forma 3950 reach-in CO2 incubator on our YouTube channel
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.
