Thermal

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We manufacture four different types of thermal fan clutches: standard duty, heavy duty, severe duty and truck fan drives. Each type is engineered to simulate the performance, fit and appearance of the original equipment clutch that it replaces. All fan clutches are for specific applications and should only be applied for which they are cataloged. Use of the incorrect fan clutch may result in poor cooling, excessive noise, reduced fuel economy or fan clutch failure. 

Standard Duty

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  • Turns fan 60-70% of shaft speed when engaged
  • Disengage to 20-30% of the shaft speed
  • Used with lighter pitch fans (1-1/2” of pitch)
  • Flat plate impeller design with up to 11.4 sq. in. of working surface
  • Identified by a smooth steel faceplate & thermal spring assembly on the front side

Heavy Duty

  • Turns the fan 70-90% of the shaft speed when engaged for increased cooling
  • Turns the fan 25-35% of the shaft speed when disengaged
  • Used with deeper pitch fans (2-1/2” of pitch)
  • Land and groove design with up to 27 sq. in. of working surface
  • Identified by finned aluminum faceplate and thermal spring on the front
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Severe Duty

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  • Turns the fan 80-90% of the shaft speed when engaged
  • Turns the fan 20-30% of the shaft speed when disengaged
  • Used with deeper pitch fans (2-1/2” of pitch)
  • Land and groove design with up to 72 sq. in. of working area
  • Larger working surface provides cooler running and longer life expectancy
  • Thicker body and deep finned faceplate dissipates more heat
  • Can be used in place of many heavy-duty clutches