Explosion-proof Duct
Heaters
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.
Compact Unit Heater
Indeeco’s Compact explosion-proof unit heater is designed with both size and economy in mind. Compact 
advantages and unique features include :
- Compact Size : This small design is only 13 inches wide, which makes it ideal for applications where limited space is available.
- Low Cost : The Compact design offers the most economical solution for heating small Class I, Group D hazardous areas. It is a cost effective alternative to the use of explosion-proof convection heaters.
- Redundant Over temperature Protection : Primary and secondary automatic reset thermal cutouts for additional safety.
- Stainless Steel Construction : Provides superior corrosionresistant protection. Optional Dirty Duty
ULTRA-SAFE™ EXP Unit Heater
Indeeco’s Ultra-Safe ™ Exp explosion-proof unit heater is designed with both safety and
versatility in mind. Unique Ultra-Safe ™ Exp features include :
- Industry’s Lowest Ignition Temperature Code Rating : T3C, 320°F (160°C)
- Dual Over temperature Protection: With both automatic and manual reset over
temperature cutouts for additional safety. - Nontoxic Propylene Glycol Heat Transfer Fluid
- Low 70 PSIG Relief Valve Setting : This assures that in an emergency, the
initial escaping vapor temperature remains below the 320°F (160°C) ignition
temperature. - Corrosive Resistant Options : INDEECO offers three constructions suitable
for most applications. Standard construction for use in dry non-corrosive areas
includes : Welded steel heat exchanger; powder-coated cabinet; epoxy-coated
motor. A 316 stainless steel construction suitable for Waste Water Treatment
Plants includes : 316 stainless steel heat exchanger, headers and tubes with
aluminum fins; stainless steel cabinet; corrosive resistance hardware;
epoxy-coated motor. Third construction is suitable for use in Chemical Plants
where chlorides are present and includes : Heresite® coated heat exchanger,
cabinet, fan blade; corrosive resistance hardware; epoxy-coated
motor.
