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Thermo Forma 3911 Refrigerated Environmental Chamber
Many laboratories require precise environmental control for stability studies and product qualification but do not need the large footprint of a full-size walk-in or 29 cubic foot environmental chamber. The Thermo Forma 3911 Refrigerated Environmental Chamber provides the same high level of temperature and humidity performance found in larger stability chambers while offering a more compact 11 cubic foot (311-liter) cabinet that fits comfortably into pharmaceutical, biotechnology, academic, and quality assurance laboratories. Designed for long-term environmental testing, the 3911 combines refrigeration, programmable temperature and humidity control, and advanced airflow management to create consistent test conditions for demanding laboratory applications.
Operating over a temperature range of 0°C to 60°C with programmable humidity from ambient to 95% RH, the Thermo Forma 3911 supports ICH stability testing, shelf-life studies, microbiological research, packaging validation, and environmental simulation. Its microprocessor-based controls and horizontal laminar airflow system maintain excellent environmental uniformity while providing rapid recovery following routine door openings, making the chamber well suited for laboratories where repeatability and regulatory compliance are critical.
Key Features
Approximately 11 cu. ft. (311 L) chamber capacity
Temperature range from 0°C to 60°C
Relative humidity control from ambient to 95% RH
Horizontal laminar airflow system
Refrigerated heating and cooling system
Watlow EZ-Zone microprocessor controls
Programmable temperature and humidity settings
Ramp-and-soak programming capability
Stainless steel chamber interior
Heated solid door to reduce condensation
Adjustable shelving system
Audible and visual alarm system
Probe access port for monitoring equipment
90-day warranty from American Instrument Exchange
Designed for Stability Testing and Controlled Environmental Studies
The Thermo Forma 3911 was engineered for laboratories requiring precise environmental control in a compact footprint. While larger environmental chambers provide additional storage capacity, the 3911 delivers the same level of temperature and humidity performance for laboratories conducting smaller stability studies, product evaluations, or biological research projects.
Its combination of refrigeration, humidity control, and programmable operation makes the chamber particularly valuable for pharmaceutical development, quality assurance, and environmental testing applications. Researchers can perform long-duration studies under tightly controlled conditions without dedicating valuable laboratory space to a larger environmental chamber.
The chamber's advanced horizontal laminar airflow system distributes conditioned air evenly across every shelf, helping maintain exceptional temperature and humidity uniformity while minimizing localized environmental variation. This consistent performance supports reproducible testing throughout extended qualification and stability studies.
Common Applications
The Thermo Forma 3911 is commonly used for:
ICH pharmaceutical stability studies
Drug development
Shelf-life testing
Packaging validation
Medical device testing
Environmental simulation
Microbiological incubation
Seed germination research
Plant science
Entomology research
Food and beverage quality testing
Quality assurance laboratories
University research
Product qualification testing
The chamber's combination of refrigeration and humidity control allows researchers to simulate a broad range of storage and testing environments while maintaining highly reproducible conditions.
Ideal Laboratory Environments
The Thermo Forma 3911 is well suited for pharmaceutical manufacturers, biotechnology companies, university research laboratories, government agencies, contract testing organizations, food and beverage quality laboratories, agricultural research facilities, and industrial research centers.
Its compact footprint makes it especially attractive for laboratories where floor space is limited but precise environmental control remains essential for regulatory testing, product qualification, or long-term research studies.
Temperature Recovery and Environmental Stability
The Thermo Forma 3911 utilizes a horizontal laminar airflow system that distributes conditioned air uniformly across the chamber using positive-pressure and negative-pressure plenums. This design promotes excellent temperature and humidity uniformity while allowing rapid recovery following routine door openings or sample loading.
Operating between 0°C and 60°C, the chamber supports both refrigerated and elevated-temperature studies while maintaining temperature stability of approximately ±0.1°C and excellent uniformity throughout the workspace. The programmable controller allows users to create multi-step ramp-and-soak profiles for accelerated aging studies, stability testing, and other complex environmental protocols requiring automated temperature transitions.
Integrated Humidity Control
Unlike refrigerated incubators that regulate only temperature, the Thermo Forma 3911 incorporates active humidity control, allowing laboratories to maintain relative humidity levels from ambient conditions to 95% RH at 37°C. Independent humidity programming enables researchers to reproduce storage environments specified by ICH guidelines and other regulatory protocols without relying on external humidification equipment.
The integrated humidity system, combined with precise temperature regulation and programmable controls, makes the 3911 an excellent platform for pharmaceutical stability testing, package validation, biological research, and long-duration environmental simulation where both temperature and humidity influence experimental outcomes.
Sample Storage Recommendations
With approximately 11 cubic feet (311 liters) of usable chamber space, the Thermo Forma 3911 is well suited for laboratories conducting small- to medium-scale stability studies, environmental simulations, and product qualification testing. The chamber can accommodate pharmaceutical samples, medical devices, packaged products, microbiological media, laboratory reagents, plant materials, seed trays, environmental monitoring equipment, and custom testing fixtures while maintaining tightly controlled temperature and humidity conditions.
The adjustable shelving system allows users to configure the chamber for a wide range of sample sizes and testing protocols. For optimum performance, materials should be distributed evenly throughout the chamber while maintaining adequate space around each item to promote unrestricted airflow. Proper spacing helps preserve the chamber's excellent temperature and humidity uniformity, particularly during extended studies.
Laboratories performing regulatory testing often organize samples by study, batch number, or collection interval to streamline retrieval and minimize unnecessary door openings. This practice helps maintain stable environmental conditions throughout long-duration testing while supporting consistent, reproducible results.
Energy Efficiency and Operating Costs
The Thermo Forma 3911 was designed to provide dependable environmental control while maintaining efficient day-to-day operation. Its insulated cabinet, microprocessor-based controls, and integrated refrigeration system work together to minimize energy consumption while maintaining precise temperature and humidity conditions over extended testing periods.
The horizontal laminar airflow system distributes conditioned air efficiently throughout the chamber, reducing temperature and humidity variation without excessive fan operation. The heated solid door helps reduce condensation during refrigerated operation, improving visibility and reducing moisture accumulation that can occur during high-humidity testing.
Because the 3911 delivers both temperature and humidity control within a compact footprint, laboratories can perform many stability and environmental qualification studies without operating a significantly larger chamber. This can reduce energy usage, conserve valuable laboratory space, and simplify routine maintenance while still providing the environmental performance required for regulated testing applications.
Key Specifications
Specification
Details
Manufacturer
Thermo Forma
Model
3911
Chamber Type
Refrigerated Environmental Chamber
Chamber Capacity
Approximately 311 L (11 cu. ft.)
Temperature Range
0°C to 60°C
Humidity Range
Ambient to 95% RH
Cooling System
Compressor Refrigeration
Heating System
Electric Heating
Airflow System
Horizontal Laminar Airflow
Controller
Watlow EZ-Zone Microprocessor
Programming
Ramp-and-Soak
Chamber Material
Stainless Steel
Door
Heated Solid Door
Shelving
Adjustable Stainless Steel Shelves
Access Port
Standard Probe Access Port
Alarm System
Audible and Visual
Interior Dimensions
Approximately 24" W × 24" D × 36" H
Exterior Dimensions
Approximately 34" W × 36" D × 72" H
Electrical Requirements
230 V
Approximate Weight
Approximately 425 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 Thermo Forma 3911 primarily used for?
The Thermo Forma 3911 is designed for applications requiring precise temperature and humidity control, including pharmaceutical stability testing, shelf-life studies, environmental simulation, packaging validation, biological research, and quality assurance testing.
How does the 3911 differ from larger Thermo Forma environmental chambers?
The 3911 offers the same fundamental environmental control capabilities found in larger Thermo Forma chambers but in a more compact 11 cubic foot cabinet. It is an excellent choice for laboratories that require precise temperature and humidity regulation without the floor space required for a larger 29 cubic foot system.
Can the chamber be used for ICH stability studies?
Yes. The programmable temperature and humidity controls make the Thermo Forma 3911 well suited for many pharmaceutical stability testing protocols, including applications requiring controlled environmental conditions consistent with common ICH storage guidelines.
Why is humidity control important for stability testing?
Many pharmaceutical products, packaging materials, biological samples, and medical devices are affected by both temperature and moisture exposure. Controlling relative humidity alongside temperature helps laboratories better simulate real-world storage conditions and generate more reliable stability data.
What is the advantage of horizontal laminar airflow?
Horizontal laminar airflow distributes conditioned air evenly across every shelf, helping maintain consistent temperature and humidity throughout the chamber. This design reduces localized environmental variation and supports reproducible testing across multiple sample locations.
Can monitoring equipment be installed inside the chamber?
Yes. The chamber includes a probe access port that allows researchers to install thermocouples, humidity probes, or data logging equipment without leaving the door open, helping preserve stable environmental conditions during long-term studies.
Is the Thermo Forma 3911 suitable for biological research?
Yes. In addition to stability testing, the chamber is frequently used for seed germination studies, plant research, microbiological applications, insect research, and other laboratory projects requiring controlled temperature and humidity conditions over extended periods.
Why purchase a refurbished Thermo Forma 3911 from American Instrument Exchange?
Purchasing a refurbished Thermo Forma 3911 from American Instrument Exchange provides laboratories with a reliable refrigerated 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 Hereto see the Thermo Forma 3911 humidity chamber on the American Instrument Exchange YouTube channel.
Click Hereto read a review of this product on our blog!
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.
