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Strainer Fire Proof Level

  Strainer fire proof rating, American UL Underwriters Laboratories Standard, UL-900-1997
Class 1
  Strainer (when clean) does not burn when meets fire, only a very small amount of smoke distribution
Class 2
  Strainer (when clean) has a slight burning when meets fire, or distribute a limited smoke, or both simultaneously happens.
  Strainer structure and fire protection classification, the United States Institute of Environmental Science and Technology, IES-RP-CC001.3-1993 Grade 1:
  Non-combustible structure, can withstand the harsh environment, structure is firm. Mainly used in military, atomic energy, important industries.
  To meet the U.S. Military Standard MIL-F-51068.
Grade 2:
  Flame-retardant structure, passed the water resistant test, low temperature resistant testing, as well as the military standard MIL-F-51068 part experiment.
  To meet the United States UL-586 standard test (flame test).
Grade 3:
  Do not burn when meets fire, only distribute trace of smoke. Comply with one level of UL-900 standard.
Grade 4:
  A slight burning when meets fire, or distribute a limited smoke. Comply with second level of UL-900 standard.
Grade 5:
  Flame-retardant material structure, no combustion-supporting material, when meets fire only produces a small amount of smoke or do not produce smoke. For air filtration at the top or side clean room blowing parts.
Grade 6:
  For the places with no special requirements for fire protection and non-essential.

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