Axial Fans
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      What are insulation levels?

      There are six insulation levels in all, each with a maximum allowable temperature. Safety standards each specify the applicable insulation level.

      Insulation level Maximum allowable temperature
      Class Y 90°C
      Class A 105°C
      Class E 120°C
      Class B 130°C
      Class F 155°C
      Class H 180°C

       

      Safety standard Insulation level
      UL Class A
      CSA Class B
      VDE Class E or B