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Terra Part #PriceShips in
120 V Free Standing Powder Coated Steel 29 cu. ft. Ambient to 60°C Stainless Steel 3920 5321-32 50158 $12,68810-20 Days2
208 V Free Standing Powder Coated Steel 11 cu. ft. Ambient to 60°C Stainless Steel 3911 5321-30 50156 $15,10510-20 Days3
208 V Free Standing Powder Coated Steel 29 cu. ft. Ambient to 60°C Stainless Steel 3940 5321-33 50159 $16,3845-7 Days4
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Product Details

• Forma Environmental Test Chambers by Thermo Fisher Scientific are ideal for drug stability studies, shelf-life testing for packaged products, and large scale biological research

• High precision chambers meet ICH, FDA, TAPPI, and ASTM testing standards

• Directed horizontal laminar flow system improves temperature uniformity, even with frequent door openings

• CFC-free foamed-in-place polyurethane insulation

• Phenolic coating prevents corrosive damage from by-products released into the chamber's atmosphere

• 2 inches of foamed-in-place polyurethane insulation provide excellent thermal stability

• Powder coated, 18-gauge cold-rolled steel exterior and solid stainless steel interior

• Standard outputs allow integration with existing alarm/monitoring systems

• Swivel, locking casters simplify installation or relocation of chambers for cleaning

• Leveling feet stabilize the chamber for safety

• Customizable chambers with dehumidification and CO2 controllers

Environmental Test Chambers

  • Environmental/Humidity Chamber; 11 cu ft, 0C - 60C, Benchtop, Forma Forma Environmental Chambers by Thermo Fisher Scientific – 11.0 cu. ft.
  • Environmental Chamber; 29 cu ft., 0C - 60C, Forma Forma Environmental Chambers by Thermo Fisher Scientific – 29.0 cu. ft.
Environmental/Humidity Chamber; 11 cu ft, 0C - 60C, Benchtop, Forma
Environmental Chamber; 29 cu ft., 0C - 60C, Forma

Features & Benefits

Features & Benefits

Benefits of Laminar Airflow

Horizontal Laminar Airflow System Assures Temperature Uniformity

Thermo Scientific's Forma Environmental Chambers feature a directed airflow system designed to optimize temperature uniformity compared to a conventional top-down airflow system. By directing airflow across the surface of each shelf, samples receive a consistent flow of conditioned air that improves testing accuracy, especially following the door-opening and recovery events. Using positive feed plenums on one side of the chamber and negative pressure return plenums on the opposite side, the horizontal laminar flow system prevents airflow obstruction due to large volumes of samples and their arrangement on the shelves.

Customizable to Fit Any Industrial, Pharmaceutical or Biotechnological Application
The Thermo Scientific Forma Series Environmental Chamber offers a wide range of options including condensate evaporators, heatless dryer systems, custom access ports, and additional electrical outlets. Factory-installed shaker support and integrated cell roller systems are also available as custom orders.
Conventional top-to-bottom undirected airflow design
Forma horizontal directed airflow design minimizes product loss and desiccation
Model Number 3911 3920 3940
Exterior Dimensions 38"W x 32"D x 51.5"H 
(965 x 813 x 1308 mm)
38"W x 32"D x 88.5"H 
(965 x 813 x 2248 mm)
38"W x 32"D x 88.5"H 
(965 x 813 x 2248 mm)
Interior Dimensions 31"W x 27"D x 24"H 
(787 x 686 x 609 mm)
31"W x 27"D x 60"H 
(787 x 686 x 1524 mm)
31"W x 27"D x 60"H 
(787 x 686 x 1524 mm)
Volume 11 cu. ft. (312 liters) 29 cu. ft. (823 liters) 29 cu. ft. (823 liters)
Temperature Control ±0.1°C @ +37°C (98.6°F) ±0.2°C @ +25°C (77°F) ±0.1°C @ +37°C (98.6°F)
Standard # of Shelves 3 6 6
Maximum # of Shelves 11 19 19
Humidity Control ±5% RH None ±5% RH
Humidity Range Above ambient to 95% None Above ambient to 95%
Electrical 208-220V 120V 208-220V
Plug Type 10' NEMA 14-20 8' NEMA 5-20 10' NEMA 14-20
Fill Port 1/8" FPT None 1/8" FPT
Drain Port 3/8" (19 mm) FPT None 3/8" (19 mm) FPT
Temperature Range 0°C to +60°C (32°F to +140°F)
Temperature Uniformity ±0.3°C at 25°C to 37°C with six shelves installed*
Shelf Surface Area 5.4 sq. ft. (0.5 m2)
Shelf Loading Capacity 35 lbs. (16 kg) slide in and out 
50 lbs. (23 kg) stationary
Interior Material 304 2B Stainless Steel
Exterior Material Cold-rolled steel
Insulation 2" (51 mm) foamed urethane
Finish Powder coated
Refrigeration Compressor 1/4 Horsepower, air cooled
Refrigerants Non-CFC R-134a
* Better than ±0.5°C uniformity at all other temperature parameters.

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