Custom Explosion-Proof Duct Heaters

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Standard Features

Hazardous locations are those areas where a potential for explosion and fire exists due to the presence of flammable gases, vapors, pulverized dusts or ignitable fibers in the atmosphere. Hazardous locations are created from the normal processing of volatile chemicals, gases, coal, grains, etc., or from the accidental failure of storage systems for these materials.

Open flames are not permitted in these locations. The use of electric heating equipment is permitted with two major restrictions: 1) The surface temperature of the equipment cannot exceed the ignition temperature of the hazardous atmosphere and 2) all arc and spark producing devices must be isolated from the atmosphere in an appropriate enclosure.

Both people and equipment in hazardous locations can be heated safely and economically with electric heat. Electric heating is typically much less expensive to install and maintain than comparable remote oil or gas fired heating systems.

Wider range of sizes than available in the other two designs

Vertical airflow

Ratings up to 750 kW, 600 volts

Control Options

Multi-stage control with built-in step controller and field installed thermostat

Single-stage ON/OFF control with field installed thermostat

Solid state control with built-in zero-cross switching SCR and field installed thermostat


“Heater On” pilot light to indicate power to the heater

24 volt transformer in place of 120 volt transformer

Built-on airflow switch in place of the fan relay

Built-on disconnect switch

Disconnecting magnetic contactors

NEMA 4, 7, 9 gasketed box for wet locations

Supplementary fusing for heaters drawing less than 48 amps

Warning pilot light to indicate overtemperature or no airflow

Closed Tank Heating

Watt Density

Percentage of Wattage

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