Your browser is out of date.

You are currently using Internet Explorer 7/8/9, which is not supported by our site. For the best experience, please use one of the latest browsers.

Air Duct Heaters

Where elements are NOT in a Hazardous Area:
• 1 thermal cut-out per heating stage, sensing element surface temperature
• 1 thermal cut-out, sensing the 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 the air temperature

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


Ex e IIC T1 to T6 Gb IP67
CU TR (formerly GOST), CCOE, CNEx, Inmetro

Request a Quote

Air Duct Heaters Terminal Box

HC Thermal's Direct Fired Heaters are made of lightweight construction, manufactured from either carbon steel (corrosion-protected) or 316L stainless steel throughout the process of direct-fired air heaters.

Air Duct Heaters Elements

HC Thermal's Direct Fired Heaters are 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.

Air Duct Heaters 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.

Supports & Voltage

  • Elements are supported in a baffle assembly to prevent flow-induced vibration
  • Element Fittings
  • Elements are sealed into the mounting flange by either brass or stainless steel bushings to facilitate the individual replacement of elements
  • Suitable for voltages up to 690V

Duct Construction

HC Thermal's Air Duct Heater is manufactured from either stainless steel or pre-galvanized sheet steel to suit the specific workingenvironment; the element-mounted flange isdesignedto enable the removal of the heater bundle without disturbing the remaining ductwork.