FX5-SD - Explosion-Proof Electric Air Unit Heater Explosion-Proof Unit Heater

The FX5 Severe Duty (SD) is the next generation Ruffneck™ explosion-proof electric air heater, built for severe duty applications that can lead to accelerated wear of electrical components and damage to the heater core, including locations with fluctuating power quality, temporary power generation, high vibration, dirty or corrosive atmospheres or extended maintenance intervals.


  • Certified for use in hazardous location areas
  • Numerous factory installed options available
  • Shunt trip circuit breaker interupts power to protect the heater core
  • Designed for severe duty hazardous location applications


Models range from 3 – 35 kW and 208 – 600V
Shunt trip line power circuit breaker
Redundant high limit protection
75 Amp industrial contactor
Explosion-proof Arctic Duty motor
Epoxy-coated, 12-gauge steel cabinet
Optional Heresite® coating and stainless steel construction for corrosive environments
CULUS certified and approved for the following Hazardous Locations Classifications: Class I, Divisions 1 & 2, Groups C & D; Class II, Division 1, Groups E, F & G and Class II, Division 2, Groups F & G. Class I, Zones 1 & 2, Groups IIA & IIB; Temperature code T3B 165°C (329°F)