Tunnel Ovens

Tunnel Ovens

  • Motor control push buttons and on-off heat switch
  • LED pilot lights
  • 5 kA short circuit current rating (SCCR)

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Tunnel ovens are designed for use with the customer’s conveyor system. 

Our experienced engineers will collect the features of your conveyor system and develop a tunnel oven to support your conveyor as well as meet your particular heat processing requirements.

Units can be provided in sections for easy installation and mating with existing conveyor system.


  • 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)
  • OS


  • Ovens processing combustible materials are required to have a fire suppression system per NFPA 86
  • 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. 

Safety Equipment

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

* Recirculating blower air flow safety switch to turn off heat on loss of recirculated air flow

* Electrical interlock shuts off heat if power to recirculating blower is interrupted

Electric Heat Includes

  • Separate heating element control contactors to turn off heat on malfunction of main control contactors

Gas heat includes

  • Modulating burner for 1000 BTU per cubic foot natural gas at 6” water column pressure – propane available.
  • Automatic pre-ignition purge period to clear accumulated gas or fumes
  • Push button electric ignition
  • Microprocessor based electronic flame safeguard protection to continuously monitor flame and close gas valves if flame is not present
  • Powered forced exhauster to provide combustion venting
  • Exhauster air flow safety switch to close gas valves on loss of venting
  • Two pilot valves to guarantee gas flow to pilot can be stopped
  • High and Low gas pressure switches to confirm safe operating pressure range
  • Two main burner safety shut off valves with valve seat position indicator to assure gas flow to main burner can be stopped
  • Proof of closure switch on one main valve 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


  • Digital temperature controller
  • Motor control push buttons and on-off heat switch
  • LED pilot lights
  • 5 kA short circuit current rating (SCCR)


Available construction features:

Oven design can include:

  • multiple heat zones
  • vertical or horizontal recirculated air flow
  • cooling zone to reduce part temperature before handling
  • unheated vestibules to reduce heat loss from ends of oven
  • support points for existing conveyor system
  • slide beds for conveyor belts
  • tracks for monorail conveyors
  • vertical lift doors tied to indexing
  • Conveyor support can be designed to accommodate all conveyor types including:
  • flat wire belts
  • woven wire belts
  • cross bar
  • multi-strand roller chain
  • monorails
  • power or free roller conveyor

Choice of

* Maximum operating temperatures up to 1200°F

* Vertical or horizontal recirculated air flow

* Aluminized steel or stainless steel interior

Electric or Gas heat

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

Design can include:

  • Multiple heat zones
  • Extended loading and unloading zones to accumulate parts
  • Wire, cross bar, roller chain, and other belt options available
  • Special belt construction or attachments
  • Support points for existing conveyor system
  • Slide beds for conveyor belts
  • Tracks for monorail conveyors
  • Cooling zone to reduce part temperature before handling
  • Unheated vestibules to reduce heat loss from ends of oven
  • Vertical lift doors tied to indexing
  • All welded construction
  • Structural steel base provides rigid assembly easily moved into position
  • Conveyor supports held by cross angles welded to vertical wall members to transfer belt load to factory floor
  • Heavy duty reducer, torque limiting device and variable frequency conveyor drive
  • Durable, electrically isolated, Incoloy tubular heating elements
  • Heat source located in heat chamber to prevent radiant heating
  • High pressure recirculating blower
  • Full coverage supply and return duct work with adjustable opposed louvers
  • Adjustable fresh air intake and exhaust outlet damper
  • Insulated with 10 lbs per cubic foot density rockwool insulation
  • Aluminized steel exterior with Trilite Green enamel finish
  • Includes 2” refractory ceramic fiber insulation on 16 gauge aluminized steel interior walls, 16 gauge 304 stainless steel heat chamber walls and stainless steel recirculating blower
  • Brushed stainless steel control panel face
  • Heavy duty access doors along oven length with explosion venting latches
  • Adjustable dampers at ends of heat zone positioned near load to reduce heat loss
  • Slip flashing at doorways allow inner oven to expand without affecting door sealing
  • Fiberglass door gasket with stainless steel spring insert
  • Fully assembled and factory tested for temperature uniformity