Air filter fire grade standard
Fire rating for air filters, UL Insurers 'Laboratory Standard, UL-900-1997
Grade II(Class 1)
The filter(when clean) does not burn in the open fire and emits only a very small amount of smoke.
Filters(when clean) are slightly burned by open fire, or emit limited smoke, or both.
Filter structure and fire classification, US Institute of Environmental Science and Technology IES-RP-CC001.3-1993
The first category(Grade 1):
Non-combustion structure, can withstand the harsh environment, strong structure. It is mainly used for military, Atomic Energy, and important industries.
Meet the United States military standard MIL-F-51068.
The second category(Grade 2):
The flame retardant structure is tested by water resistance tests, low temperature tests, and part of the military standard MIL-F-51068.
Test to meet the UL-586 standard in the United States(flame test).
The third category(Grade 3):
In the event of fire, it does not burn, but only emits trace amounts of smoke. Level 1 of the UL-900 standard.
The fourth category(Grade 4):
Light combustion or limited smoke in contact with fire. Meet the second level of the UL-900 standard.
Category V(Grade 5):
The structure of flame retardant material, no flame retardant material, produces only a small amount of smoke or does not produce smoke in the event of fire. For air filtration at the top or side of the clean room.
The sixth category(Grade 6):
For places without special fire protection requirements and not very important
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