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Air Heaters

The ISE type electric heaters comprise a range of Ex e air duct heaters, custom built to meet client specification and suitable for use in Zone 1 or Zone 2 hazardous areas.

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  • Certified to ATEX or IECEx standards
  • A range of Ex e Gas Group IIC, increased safety certified duct air heaters
  • Temperature classifications T2 to T6
  • Elements are certified Ex e for use in Zone 1 hazardous areas
  • Elements are individually replaceable on site without the need for special tools
  • Terminal box is certified weatherproof to IP66 and IP67
  • Anti-condensation heater fitted if required
  • Various types of over-temperature cut-outs available, e.g. thermostats, RTD’s or thermocouples

  • Air handling units
  • Drying ovens
  • Furnace heating
  • HVAC duct heating
  • Space heating


  • ATEX / IECEx EX logo II 2 G
    Ex e IIC T1 to T6 Gb IP67
  • CU TR (EAC), CCOE, CNEx, Inmetro

Terminal Box

  • Lightweight construction, manufactured from either carbon steel (corrosion protected) or 316L stainless steel throughout

Heating Elements

  • Manufactured from 80/20 NiCr resistance wire with high purity compacted magnesium oxide powder sheathed with corrosion/erosion resistant tube (eg: Incoloy 800/825, 316/316L stainless steel, Inconel 600/625, 321 stainless steel, Titanium)

Duct Construction

  • Manufactured from either stainless steel or pre-galvanised sheet steel to suit the specific working environment; the element-mounted flange is designed to enable removal of the heater bundle without disturbing the remaining ductwork

Supports on the heating elements

  • Elements are supported in a baffle assembly to prevent flow-induced vibration


  • Suitable for voltages up to 690V

Installation of the heating elements

  • Elements are sealed into the mounting flange by either brass or stainless steel bushings to facilitate individual replacement of elements

Special Features

  • Where a hazardous gas is present within the duct, the elements are supplied certified Ex e for use in an ATEX / IECEx Zone 1 Area

Temperature Monitoring

Generally over temperature protective devices are installed as follows:

Where elements are NOT in a hazardous area:

  • 1 thermostat per heating stage, sensing element surface temperature
  • 1 thermostat sensing air temperature

Where elements ARE in a Hazardous Area:

  • 3 thermal cut-outs (1 per phase), per heating stage sensing element surface temperature
  • 1 thermal cut-out sensing air temperature

Note: The air temperature sensor is not required if the terminal box is thermally spaced from the duct

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