Front view of Thermo Forma Model 3920 environmental chamber featuring top digital control header and a full-length glass door showing interior shelving

Thermo Forma Environmental Chamber Model 3920 glass door

Brand : Thermo

Product Code : SKU 3175ZZ INC

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Thermo Scientific Forma 3920 Glass Door Environmental Chamber

Large-capacity environmental chambers play an essential role in pharmaceutical research, biological sciences, agriculture, and quality assurance laboratories where maintaining stable temperatures over extended periods is critical. The Thermo Scientific Forma 3920 Glass Door Environmental Chamber is engineered to provide precise refrigerated temperature control for applications including pharmaceutical stability studies, shelf-life testing, environmental simulation, microbiology, plant research, and insect rearing. Featuring a 29 cubic foot (821-liter) chamber, programmable temperature control, Thermo Scientific's Directed Airflow System, and a full-height insulated glass observation door, the Forma 3920 allows researchers to monitor experiments without disturbing carefully controlled chamber conditions.

Unlike conventional laboratory incubators that operate only above ambient temperatures, the Forma 3920 combines refrigeration and heating to maintain temperatures from 0°C to 60°C, making it suitable for both refrigerated incubation and elevated temperature testing. Its large-capacity chamber accommodates oversized product loads while maintaining excellent temperature uniformity, making it an outstanding choice for long-term environmental studies, biological research, and product testing. Purchasing a refurbished Thermo Scientific Forma 3920 Environmental Chamber from American Instrument Exchange provides laboratories with premium environmental testing capability at substantial savings compared to purchasing new equipment.

Thermo Scientific Forma 3920 Glass Door Environmental Chamber Key Features

29 cu. ft. (821 L) chamber capacity
Temperature range: 0°C to 60°C
Refrigerated environmental chamber
Full-height heated insulated glass observation door
Directed Airflow System for excellent temperature uniformity
Digital microprocessor controller
Programmable ramp and soak temperature profiles
RTD temperature sensor
Standard access ports for data logging
Automatic defrost system
Four adjustable stainless steel shelves included
Accommodates up to nineteen adjustable shelves
120V, 60 Hz operation
90-day warranty from American Instrument Exchange

Designed for Long-Term Environmental Testing

The Forma 3920 is designed for laboratories requiring highly stable environmental conditions over extended testing periods. Its refrigeration system allows temperatures below ambient, while the microprocessor controller supports programmable temperature profiles for studies involving gradual temperature changes or complex testing protocols. Thermo Scientific's Directed Airflow System distributes conditioned air uniformly across every shelf, promoting excellent chamber uniformity even when the chamber is fully loaded.

Unlike the solid-door version, this configuration features a heated insulated glass door that allows researchers to observe samples throughout testing without opening the chamber. Reducing unnecessary door openings helps preserve stable chamber conditions while allowing visual inspection of experiments, making the glass-door configuration particularly useful for biological research, plant growth studies, and other applications requiring routine observation.

Common Applications

The Thermo Scientific Forma 3920 Glass Door Environmental Chamber is commonly used for:

Pharmaceutical drug stability studies
Shelf-life testing
Product aging studies
Environmental simulation
Microbiology research
Plant growth studies
Seed germination
Entomology research
Biological incubation
Food and beverage testing
Packaging validation
Academic research

Environmental chambers are frequently paired with laboratory refrigerators for sample storage, ultralow temperature freezers for long-term preservation, biosafety cabinets for sterile sample preparation, and centrifuges for routine laboratory processing to create a complete laboratory workflow.

Ideal Laboratory Environments

The Thermo Scientific Forma 3920 is an excellent choice for pharmaceutical manufacturers, biotechnology companies, contract research organizations, university research laboratories, agricultural research facilities, food science laboratories, environmental testing laboratories, and industrial quality assurance departments. Its combination of refrigerated temperature control, large chamber capacity, programmable operation, and a glass observation door makes it particularly valuable for laboratories conducting long-duration studies where continuous visual monitoring is beneficial.

Why Choose a Glass Door Environmental Chamber?

For many biological and environmental research applications, frequent visual inspection is necessary to monitor sample condition, plant growth, microbial development, or experimental progress. Opening the chamber door repeatedly can disrupt carefully controlled temperatures and extend recovery times.

The heated insulated glass door on the Forma 3920 allows researchers to observe experiments without disturbing chamber conditions. Combined with Thermo Scientific's Directed Airflow System, programmable temperature control, refrigerated operation, and large-capacity chamber, the glass-door configuration offers an ideal balance of environmental stability and convenient sample observation for demanding laboratory applications.

Thermo Scientific Forma 3920 Glass Door Environmental Chamber Performance and Environmental Stability

The Thermo Scientific Forma 3920 is engineered to provide highly stable temperature control for long-duration environmental testing and biological research. Its refrigeration and heating systems work together to maintain temperatures from 0°C to 60°C, allowing laboratories to perform both refrigerated and elevated-temperature studies within a single platform. Thermo Scientific's Directed Airflow System continuously circulates conditioned air throughout the chamber, promoting excellent temperature uniformity and minimizing gradients between shelves, even when the chamber is fully loaded.

The heated insulated glass door allows researchers to observe samples without opening the chamber, reducing unnecessary temperature disturbances during lengthy experiments. Combined with programmable ramp and soak temperature profiles, automatic defrost operation, and an RTD temperature sensing system, the Forma 3920 delivers the environmental consistency required for reproducible pharmaceutical, biological, and industrial testing applications.

Thermo Scientific Forma 3920 Typical Samples and Testing Applications

The Forma 3920 Environmental Chamber is designed to support a broad range of environmental simulation and controlled-temperature testing applications. Common samples include pharmaceutical products, biologics, vaccines, diagnostic reagents, packaged medical devices, cosmetic formulations, food and beverage products, agricultural samples, plant tissue cultures, seeds, insects, microbial cultures, and research specimens requiring stable environmental conditions throughout extended testing periods.

Researchers frequently use the chamber for ICH stability studies, accelerated aging, shelf-life determination, packaging validation, environmental stress testing, microbiological incubation, plant physiology research, seed germination, entomology studies, quality assurance testing, and other applications where precise temperature regulation and continuous sample observation are important.

Thermo Scientific Forma 3920 Glass Door Environmental Chamber Specifications

Specification	Details
Manufacturer	Thermo Scientific
Model	Forma 3920
Equipment Type	Refrigerated Environmental Chamber
Chamber Capacity	29 cu. ft. (821 L)
Temperature Range	0°C to 60°C
Temperature Accuracy	±0.1°C at 37°C
Temperature Uniformity	±0.3°C
Temperature Sensor	RTD
Airflow System	Directed Airflow System
Controller	Digital Microprocessor
Standard Shelves	4 Stainless Steel Shelves
Maximum Shelf Capacity	19 Shelves
Internal Dimensions	31 × 27 × 60 in. (W × D × H)
External Dimensions	38 × 32 × 88.5 in. (W × D × H)
Door Configuration	Heated Insulated Glass Door
Electrical Requirements	120V, 60 Hz
Weight	Contact American Instrument Exchange

Specifications are compiled from Thermo Scientific manufacturer documentation and American Instrument Exchange product information. Certain specifications may vary depending on production year and factory-installed options. Please verify installation requirements prior to purchase.

Thermo Scientific Forma 3920 Glass Door Environmental Chamber Frequently Asked Questions

What is the difference between the Forma 3920 and the Forma 3940?

The primary difference is configuration. The Forma 3920 is a refrigerated environmental chamber designed for precise temperature-controlled applications with a heated insulated glass observation door. The Forma 3940 configuration includes additional humidity and carbon dioxide control for applications requiring a more comprehensive environmental simulation.

Why choose a glass door environmental chamber?

A heated insulated glass door allows researchers to monitor samples without opening the chamber. This reduces temperature disturbances, shortens recovery times, and makes it easier to observe plant growth, biological cultures, or long-term experiments while maintaining stable environmental conditions.

What types of testing can be performed in the Forma 3920?

The chamber is commonly used for pharmaceutical stability testing, accelerated aging, shelf-life studies, microbiological incubation, environmental simulation, plant research, seed germination, food and beverage testing, packaging validation, and numerous other laboratory applications requiring refrigerated temperature control.

Can the Forma 3920 maintain temperatures below room temperature?

Yes. The integrated refrigeration system allows the chamber to operate from 0°C to 60°C, enabling both refrigerated storage studies and elevated-temperature testing within a single unit.

Why is directed airflow important?

Directed airflow continuously circulates conditioned air throughout the chamber, helping maintain consistent temperatures on every shelf while minimizing temperature gradients that could affect sensitive experiments.

Is this chamber suitable for pharmaceutical stability testing?

Yes. Its programmable temperature control, excellent chamber uniformity, large-capacity interior, and long-term environmental stability make it well suited for many pharmaceutical and quality assurance testing protocols.

Why purchase a refurbished Thermo Scientific Forma 3920 Glass Door Environmental Chamber from American Instrument Exchange?

A refurbished Thermo Scientific Forma 3920 Glass Door Environmental Chamber from American Instrument Exchange provides laboratories with a dependable, large-capacity environmental testing platform at a substantial savings compared to purchasing new equipment. Featuring an 821-liter chamber, temperature control from 0°C to 60°C, Thermo Scientific's Directed Airflow System, a heated insulated glass observation door, and programmable temperature control, the Forma 3920 is an excellent solution for pharmaceutical stability testing, biological research, environmental simulation, and long-term laboratory studies. Every unit is thoroughly inspected and tested prior to shipment and includes a 90-day warranty for added confidence.

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.

Please contact our team at info@americaninstrument.com for more details.

FAQ

Does the equipment come with a warranty?

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.