NOTE:
1) level of fire danger building structures shall be determined by testing in accordance with current standards of Vietnam or equivalent.
2) Allowing determine fire danger level of components without trial as follows:
+ Rating on K0 level, if only components manufactured from non-flammable materials;
+ Ratings to level K1, if the outer surface of the structural components are made of materials and technical indicators on fire Ch1 not more dangerous, BC1, SK1;
+ Rating on K2 level, if the outer surface of the structural components are made of materials and technical indicators are not more dangerous fire CH2, BC2, SK2;
+ K3 classified level, if the outer surface of the component is made from the material only has one of the specifications of the fire is CH3, BC3, SK3.
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