Blue M Class A Batch Oven

Batch Series Class A Mechanical Convection Ovens

Blue M Class A Batch Ovens are designed according to NFPA 86 requirements for the processing of alcohol, solvent mixes or other volatiles. These ovens employ open-air heater elements whose temperatures operate well above the auto ignition point of some flammable materials. This condition is mitigated by maintaining a very high exhaust rate with the introduction of fresh ambient air at a rate that makes process air nonexplosive.
A negative pressure is maintained in the work chamber, ensuring that all hazardous vapors will be expelled through the exhaust duct and not through the oven door, blower shaft seal or apertures. These ovens are complete systems. No additional equipment or customized procedures are required to meet the recommendations of NFPA 86 for processing hazardous workloads.

General Class A Batch Oven Specifications

  • Temperature range: 15°C above ambient to 316°C (600°F)
  • Control Accuracy: +/-1.0°C (+/- 1.8°F)
  • Resolution: +/-0.1°C (+/- 0.1°F)
  • Workspace capacity: 16.0 to 96.0 cubic feet
  • Heat up time to 316°C (600°F) (empty chamber): 90 min. (or less depending on model, voltage, and exhaust rate)
  • Uniformity: Blue M can provide varying levels of uniformity; if you have a specific tolerance or specification which must be met, please contact us with your
    requirements so we can ensure the equipment is designed, tested, and adjusted to meet those requirements

Uniform, Accurate and Reliable Temperature Control 

  • Available with profiling or single set point temperature controls
  • Horizontal air flow assures uniform thermal performance under most loading conditions
  • Exclusive Blue M Eterna heating elements – the most reliable available, with heavy-gauge high temperature nickel chromium wire and low-watt density for longer service
  • Direct drive, multi-blade, centrifugal blower with high-volume air delivery and dynamically balanced for noise reduction

Oven Features

  • Fully welded and sealed inner chamber
  • Circulation and exhaust blowers using stainless steel blower wheels are rendered
    spark resistant through the use of aluminum blower housings and aluminum inlet rings. Each are equipped with a differential air pressure type switch
  • Automatic initial timed purge air cycle
  • Exhaust blower system maintains a safe air ventilation rate through the oven with a
    constant exchange of fresh ambient air with process air
  • Pressure relief (blowout) panel installed in the chamber rear wall is guarded and retained by a steel safety retaining cage
  • Door switch disables heat and circulation blower upon door opening and initiates the
    purge cycle
  • Emergency shutdown pushbutton switch
  • Safety warning placard is installed on the front of the oven
  • Multiple shelf levels
  • Fiberglass insulation to ensure safe cabinet skin temperature
  • Heavy-duty door - double-wall, insulated construction
  • Independent, over-temperature protection (high limit controller) included
  • Corrosion resistant, stainless steel (type 304) interior
  • All-welded, heavy-duty exterior with heavy-gauge, reinforced, cold-rolled steel
  • Baked on white powder-coated enamel finish on exterior for long-lasting corrosion
  • Every oven is fully assembled and individually factory tested
  • Circuit breaker provided for ground fault protection as standard
  • Three phase operation available in 50 Hz or 60 Hz
  • Can be built as truck-in style or reach-in cabinet style

Available Oven Options

  • Stainless steel shelves
  • 24-hour, 7-day digital process timer
  • Temperature recorders (paper or paperless)
  • Programmable controller, Ethernet and USB communications
  • Data logging and trending
  • Reverse door hinge
  • Special truck channel or flat uninsulated floor for customer designed racks
  • Stainless steel, roll-in rack
  • Stainless steel, roll-in rack shelves
  • Variable frequency drive on circulation blower
  • Exclusive, adjustable, semi-pierced duct walls for tuning of air flow
  • Lead-in ports (various locations available)
  • Electro-mechanical or pneumatic door lock
  • Light tower assembly with audible alarm
  • Maintenance lock-out system
  • Main power fused disconnect switch
  • Redundant over-temperature protection (high limit controller)
  • UL508A labeled control panel
  • Alternative exterior finishes
  • CE Mark
  • If inert purge is required, please contact the factory for a quote on LOC (Limited Oxygen Concentration) Class A Ovens


Blue M warrants the equipment will be free from defects in material and workmanship for a period of two (2) years from the date of shipment (or from the installation date if this service is provided by TPS or a TPS approved partner and the date is approved by TPS). If a TPS Preventive Maintenance Plan is purchased before the end of the standard warranty period, these limited warranties shall be extended by one (1) additional year. If within the warranty period the original purchaser notifies Blue M in writing of an alleged non-conformity, and Blue M determines to its reasonable satisfaction that the product or service is in fact non-conforming, then Blue M shall, at its option and expense, repair or replace the non-conforming product or correct the non-conforming service, either at the original purchaser’s facility, or Blue M’s. Labor is only included for domestically installed units. Equipment installed outside of the United States (USA) will be one year parts only from date of shipment. For full details, exclusions, and other information on our warranty please go to: /support/blue-m


  • Watlow EZ Zone PM (PID)

    Watlow EZ Zone PM (PID)

    • Single-channel, ¼ DIN, non-profiling-type controller
    • Type J thermocouple for temperature measurement
    • Fully programmable menu system
    • Auto-Tune is provided for fast, efficient start ups


  • Watlow F4T Temperature Controller

    Watlow F4T Temperature Controller

    The Watlow F4T Temperature Controller with INTUITION™ temperature process controller combines the flexibility of a modular I/O controller with best-in-class ease of use.


    • 4.3-inch, color touch panel with high-resolution, graphical user-interface
    • 1 to 4 control loops with TRU-TUNE+ adaptive control algorithm for superior controllability
    • 40 ramp and soak profiles with real-time clock and battery backup.
    • Ethernet Modbus® TCP connectivity
    • High-speed USB 2.0 host port
    • Modular design, which offers numerous types of field pluggable modules for maximum flexibility and easiest compatibility
    • Optional Data Logging capability
    • Optional Graphical Trend Chart
    • TPS provides panel mounted USB and Ethernet ports located on the front control panel of the equipment
  • Eagle Signal Model B856 Digital Process Timer

    Eagle Signal Model B856 Digital Process Timer

    • Programmable 1/16 DIN timer
    • 5 selectable standard timing operations and 5 selectable time ranges
    • Audible alarm
  • VersaTenn V / Synergy Touch Interface Control System - Nano Version

    VersaTenn V / Synergy Touch Interface Control System - Nano Version

    • ¼ DIN profiling controller
    • Pentium class processor, 1GB On-Board Flash, and 64MB SDRAM
    • Color touchscreen interface
    • Window's CE OS
    • RS-232 serial data communications
    • USB flash drive port
    • Connected Factory
    • Type J thermocouple
  • Light Tower

    Light Tower

    • Green, amber, red light with alarm to visualize oven operation
  • Yokogawa UP55A Controller

    Yokogawa UP55A Controller

    • Profiling-type, 1/4 DIN, single-channel controller
    • 30 profiles with up to 300 linkable segments
    • Eight digital inputs and outputs
    • LCD display
    • Type J thermocouple
    • Ladder-sequencing function
    • Optional LL50A Parameter Setting Software
    • Optional data communications
  • 24 Hour / 7 Day Digital Timer - Grasslin FM1D

    24 Hour / 7 Day Digital Timer - Grasslin FM1D

    • Start-and-stop, 24-hour / 7-day oven operation
    • 20 programmable cycles
    • Manual, 3-way override
  • Chart Recorder

    Chart Recorder

    • Circular or strip type
    • Records temperature versus time
    • Some models include digital display
    • J thermocouple for temperature measurement

  • Electro-mechanical or Pneumatic Door Lock

    • Prevents door opening during process cycle
    • Strike plate mounted at door bottom


  • Thermal Product Solutions
  • Thermal Product Solutions
  • Thermal Product Solutions


Condensed Specifications
Model 166 246 326 366 606 966
Interior Volume 16.0 cu. ft. 24.0 cu. ft. 32.0 cu. ft. 36.0 cu. ft. 60.0 cu. ft. 96.0 cu. ft.
Interior Dimensions
WxDxH in(mm)
24 x 24 x 48
(610 x 610 x 1219)
36 x 24 x 48
(914 x 610 x 1219)
48 x 24 x 48
(1219 x 610 x 1219)
36 x 36 x 48
(914 x 914 x 1219)
36 x 48 x 60
(914 x 1219 x 1524)
48 x 48 x 72
(1219 x 1219 x 1829)
Exterior Dimensions
WxDxH in(mm)
55 x 48 x 87
(1397 x 1219 x 2210)
67 x 48 x 87
(1702 x 1219 x 2210)
79 x 48 x 87
(2007 x 1219 x 2210)
67 x 59 x 87
(1702 x 1499 x 2210)
77 x 72 x 97
(1956 x 1829 x 2464)
89 x 72 x 109
(2261 x 1829 x 2769)
Machine Footprint 18.3 sq. ft. 22.3 sq. ft. 26.3 sq. ft. 27.5 sq. ft. 38.5 sq. ft. 44.5 sq. ft.
Electrical Service
208 VAC 3 Ph 60 Hz
Line current
13.5 kW
16.0 kW
20.0 kW
20.0 kW
240 VAC 3 Ph 60 Hz
Line current
18.0 kW
21.0 kW
27.0 kW
27.0 kW
480 VAC 3 Ph 60 Hz
Line current
18.0 kW
21.0 kW
27.0 kW
27.0 kW
36.0 kW
48.0 kW

Voltage - all models: 208/240/480V 3-Phase / 60Hz, except DC-966A-GHP-1 which is 480V only.
All specifications are subject to change without notice.