Class A Bench Ovens

Class A Bench Ovens

  • Uniformity at 50°F below maximum temperature
  • Rise Time in minutes to 50°F below maximum temperature
  • Tests run with empty oven and minimum exhaust

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These rugged bench ovens are designed for a wide variety of industrial heat processing applications including those where flammable solvents or vapors will be present in the oven.

Model NBS-400 meets the requirements of OSHA and National Fire Protection Association Standard 86 for Class A ovens. Not for use in hazardous locations as defined in the National Electric Code.

Operating Characteristics

  • Accuracy as percent of controller span
  • Uniformity at 50°F below maximum temperature
  • Rise Time in minutes to 50°F below maximum temperature
  • Tests run with empty oven and minimum exhaust
  • Performance will vary with load and application

Certifications

  • Meets the Requirements of the Following Standards:
  • NFPA 86 (Standard for Ovens and Furnaces)
  • NFPA 70 (National Electric Code)
  • OSHA

Caution:

  • When processing combustible material fire protection should be considered
  • Designed for processing maximum of 3 ounces (0.024 gallons) flammable solvents or vapors per batch at a maximum temperature of 400°F. Do not exceed this solvent volume.

Safety Equipment

  • Adjustable manual reset excess temperature interlock to turn off heat on malfunction of main temperature controller
  • Separate heating element control contactors to turn off heat on malfunction of main control contactors
  • Recirculating blower air flow safety switch to turn off heat on loss of recirculated air flow
  • 35 CFM powered forced exhauster to provide safety ventilation to remove solvent vapors
  • Exhauster air flow safety switch to turn off heat on loss of safety ventilation
  • Purge timer provides time delay to allow exhauster to pull four oven volumes of air through the oven prior to turning on heat to clear any accumulated solvent fumes from oven

Controls

  • Analog non-indicating temperature controller
  • Amber pilot light to indicate blower and exhauster operation
  • Red pilot light to indicate heater operation
  • On-Off switch

Construction

  • 208 Volt (19 amps),230 Volt (21 amp),460 Volt (10 amp),1 phase, 50-60 HZ
  • 3-wire cord on 208 and 230 volt models
  • 460 volt models incoming power must be hardwired to control panel
  • Durable, electrically isolated, Incoloy tubular heating elements
  • Heating elements located in heat chamber to prevent radiant heating
  • Recirculating blower
  • Insulated with 6 lbs per cubic foot density rockwool insulation
  • 304 stainless steel interior with plated hardware
  • Brushed stainless steel exterior
  • Silicone rubber door gasket
  • Fully assembled and factory tested


READ ON OUR BLOG:

Standard & custom-made Grieve ovens in action

*** CAUTION:  Ovens processing combustible material are required by National Fire Protection Association 86 Standard for Ovens and Furnaces (NFPA 86) to have a fire suppression system.  If flammable solvents or vapors are present in an oven, OSHA requires conformance with NFPA 86 Class A Oven requirements.  A powered forced exhauster and other non-standard safety equipment must be added. 

MODELWORKSPACEOUTSIDE DIMENSIONS*(WXDXH)MAX TEMPBLOWERHEAT INPUTINSULATION THICKNESSOPERATING CHARACTERISTICS†APPROX SHIPPING WEIGHT
DIMENSIONS(WXDXH)VOLUMECU FTCFMHPELECTRICKWGASBTU/HRCONTROL ACCURACYTEMPERATURE UNIFORMITYRISE TIME (ELECTRIC)RISE TIME (GAS)
NBS-40028" x 24" x 18"741" x 30" x 39"400°FNot AvailableNA4Not Rated2"±0.5%±10°F40Not Available300 lbs