Materials Testing
    Heavy Duty Box Furnace

Heavy Duty Box Furnace

  • Grieve - HD-153015, HD-183618, HD-243618, HD-243624 and more
  • Uniformity at 100°F below maximum temperature
  • Tests run with empty oven and minimum exhaust
  • Combustion blower overhang 36″ rear

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Why buy from Geneq? - find out more

These  furnaces are used for a variety of heat treating applications such as tempering, hardening, sintering or firing, including those requiring inert atmospheres. 

Precision microprocessor based temperature controls and energy-saving insulation maximize the performance of these rugged units.

Outside Dimensions

  • All Models: Control panel overhang 9″ right side
  • Gas Models
  • Combustion blower overhang 36″ rear
  • Gas spring assists operation. Construction similar to electric door
  • Heating elements located on sidewalls and roof only; 13.5 KW

Operating Characteristics

  • Accuracy as percent of controller span
  • Uniformity at 100°F below maximum temperature
  • Rise Time in minutes to 100°F below maximum temperature
  • Tests run with empty oven and minimum exhaust
  • Performance will vary with load and application


  • UL Listed Control Panel
  • Meets the Requirements of the Following Standards:
  • NFPA 86 (Standard for Ovens and Furnaces)
  • NFPA 70 (National Electric Code)
  • FM (Factory Mutual)
  • OSHA


  • When processing combustible material fire protection should be considered
  • Not for use with flammable solvents or vapors. Other models available for these applications

Safety Equipment

  • Adjustable manual reset excess temperature interlock to turn off heat on malfunction of main temperature controller

Electric Heat Includes

  • Separate heating element control contactors to turn off heat on malfunction of main control contactors
  • Door interlock turns off power to heating elements when door is opened to protect operator from line voltage at heating elements

Gas Heat Includes

  • Multiple modulating burners fired under hearth from opposing sides to circulate heated air (single burner at top of work space on HD-153015)
  • Automatic pre-ignition purge period to clear accumulated gas or fumes from furnace
  • Push button electric ignition
  • Microprocessor based electronic flame safeguard protection for each burner to continuously monitor flame and close gas valves if flame is not present
  • Combustion air blower
  • Combustion Blower air flow safety switch to close gas valves on loss of combustion air flow
  • High and Low gas pressure switches to confirm safe operating pressure range
  • Two pilot valves for each pilot to guarantee gas flow to pilot can be stopped
  • Two main safety shut off valves for each burner with valve seat position indicator to assure gas flow to each main burner can be stopped
  • Proof of closure switch on one main valve at each burner to prevent igniting pilot unless main valve is closed
  • Leak test station at each pilot and main burner valve to allow testing for leakage through valve
  • Door interlock drives main burners to low fire as door is opened to protect operator from flames


Choice of

* Air or Inert Atmosphere construction

* Electric or Gas heat (Air construction only)

* 208 volt, 230 volt or 460 volt, 3-phase, 60 HZ – other input power available

  • All welded construction
  • High temperature Kanthal A-1 coiled wire heating elements supported in vacuum cast refractory ceramic fiber located on all walls and beneath hearth
  • 1000 BTU per cubic foot natural gas at 2 psig pressure – propane available. Inlet 1” NPT up to 800,000 BTU/hr, 1-¼ “ NPT to 1,000,000 BTU/hr, 1-½” NPT above 1,000,000 BTU/hr
  • Insulated with 9”of light weight, energy saving refractory ceramic fiber
  • Load supporting floor insulated with 4” of 18-½ lbs per cubic foot density 1900⁰F block and 4-½” of firebrick,
  • 3/16” steel plate reinforced furnace shell with Trilite Green enamel finish
  • ½” thick steel front plate around door
  • Fire brick throat and doorsill to protect furnace during loading
  • Brushed stainless steel control panel face
  • Powered vertical lift door (gas spring assisted manual door on HD-153015)
  • o Electric door: Electromechanical operator pivots door, supported by structural steel arms and bearings, upward above furnace
  • o Air door: Air cylinder lifts door hanging from heavy duty roller chain supported by sprockets, shaft and pillow block bearings
  • Door hot side faces away from operator
  • Soft insulation on door hot face seals against throat brick and steel front plate
  • 2” thick , heavy duty ceramic hearth plates supported by fire brick piers
  • Fully assembled and factory tested


Standard & custom-made Grieve ovens in action

*** Not for use with flammable solvents, vapors, or gases ***

HD-15301515" x 30" x 15"3.937" x 53" x 63"2,000°F18225,0009"± 0.3%±15°F453578"2301,500 lbs
HD-18361818" x 36" x 18"6.855" x 79" x 74"2,000°F24300,0009"± 0.3%±15°F175130100"3202,650 lbs
HD-24361824" x 36" x 18"961" x 78" x 77"2,000°F33360,0009"± 0.3%±15°F135120100"4503,000 lbs
HD-24362424" x 36" x 24"1261" x 78" x 80"2,000°F40440,0009"± 0.3%±15°F125110112"4503,600 lbs
HD-24482424" x 48" x 24"1661" x 92" x 80"2,000°F48525,0009"± 0.3%±15°F120105112"6004,100 lbs
HD-30483030" x 48" x 30"2567" x 92" x 86"2,000°F56650,0009"± 0.3%±16°F12090118"7504,500 lbs
HD-36483636" x 48" x 36"3673" x 92" x 93"2,000°F66750,0009"± 0.3%±18°F140100133"9505,250 lbs
HD-30603030" x 60" x 30"31.367" x 104" x 86"2,000°F60700,0009"± 0.3%±16°F135105118"8505,100 lbs
HD-36603636" x 60" x 36"4573" x 104" x 93"2,000°F73800,0009"± 0.3%±18°F140100133"11505,700 lbs
HD-36723636" x 72" x 36"5473" x 116" x 93"2,000°F86950,0009"± 0.3%±18°F14095133"13506,300 lbs
HD-48483648" x 48" x 36"4885" x 92" x 93"2,000°F78850,0009"± 0.3%±20°F13590133"12006,200 lbs
HD-48484848" x 48" x 48"6485" x 92" x 105"2,000°F921,000,0009"± 0.3%±20°F13090157"14006,900 lbs
HD-48724848" x 72" x 48"9685" x 116" x 105"2,000°F1351,400,0009"± 0.3%±22°F12090157"20008,500 lbs