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Thermo Scientific™ Forma™ Environmental Chambers Available on GSA/VA Contract for Federal Government customers only.

Perform a variety of applications with these environmental chambers, which can be configured for a variety of purposes and are available in multiple capacities.

Manufacturer:  Thermo Scientific™ 3920

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Catalog No. 13-262-340

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Perform a variety of applications withThermo Scientific™ Forma™ environmental chambers, which can be configured for a variety of purposes and are available in multiple capacities. With a wide range of accessories and years of experience in constructing cabinets, we can construct units to match your most stringent applications.

Broad Range of Features and Controls:

  • Wide temperature range of 0° to 60°C that enhances the flexibility of the unit
  • Relative humidity control via steam generator from above ambient to 95% at 37°C (not available w/Cat. No. 3920)
  • Sophisticated digital controls
  • Programmable ramp and soak cycles for temperature and RH†
  • Durable cabinets with true laminar airflow through side plenums for extremely tight uniformity
  • Phenolic-coated evaporator for use in applications that create corrosive byproducts
  • Manual control of defrost and refrigeration cycles
  • Visible/audible safety alarms alert to over- and undertemperature conditions, deviation of humidity from set parameters (except Model 3920)

Durable Construction:

  • Cold-rolled steel, powder-coated cabinet
  • 2 in. (5.1cm) thick, CFC-free, foamed-in-place polyurethane insulation
  • Stainless-steel interior with solid stainless-steel adjustable shelves
  • Directed horizontal airflow system for excellent uniformity
  • Locking swivel casters for easy mobility during installation and cleaning
  • Leveling feet for stability and added safety in the lab

Broad Range of Options:

  • Interior lighting for Models 3920, 3940 and 3949 (Optional)
  • Reinforced shelving and flooring for heavy loads
  • Heatless dryer for lower humidity levels
  • Access ports for probes, sensors
  • Interior convenience receptacles
  • CO2 (IR sensor)
  • 6 in. and 12 in. temperature chart recorder
  • Other custom options available

Compatible with:

  • Recorders (197075, 198036, 198039, 198042, 201144, 201145, 201146, 201147)
  • Reach-In/Environmental Chamber Solid Stainless-steel Shelf (224139)
  • Reach-In/Environmental Chamber Perforated Stainless-steel Shelf (224155)
  • Reinforced Stainless-steel Shelf (224161)
  • Fixed Reinforced Stainless-steel Shelf for two shakers (1900005)
  • Stainless-steel Door Glass Cover, factory installed (190591)

Recommended for:

Ideal for growth, stability and shelf-life testing applications

Ordering Information

† Humidity controller available on 3940/3949, 3911/3913 only


Description & Specifications


29 cu. ft.
88.5 in.
32 in.
60 in.
27 in.
Cold-rolled steel, powder-coated cabinet
6 supplied; 19 max.
Temperature ramp and soak, up to 24 steps
1/4hp, air-cooled
1750W (6000 BTU/hr.) at 220V, 1600W (5500BTUH) at
Adjustable defrost timer; factory set for two 15-min. defrost cycles/24 hr.
27 x 31 x 60 in. (68.6 x 78.7 x 152.4cm)
38 in.
31 in.
Digital dual LED
0° to 60°C
±0.3 at 25° to 37°C
±0.1 at 25° to 37°C
Relative humidity control via steam generator from above ambient to 95% at 37°C
Interior Lighting
CFC-free, R134A
29 cu. ft., 821.2L
120V 60Hz
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