Construction and Installation Engineering Equipment Co., Ltd. supply Suzhou fire doors, Jiangsu Huai'an of Zhenjiang, Nanjing, Kunshan, Yangzhou, the anti-gate price 

 The main changes of the new version of fire doors 
 New fire doors national standard GB 12955-1991, GB 14101-1993, the main changes are as follows: 
 An increase in functional classification of fire doors and fire doors normally open points, normally closed fire doors, the activities of fire doors; 
 2 pairs of fire doors, fire resistance classification has been modified from the original A, B and C classification changed edition insulated fire doors (Class A) "," part of the insulation of fire doors (Class B) and "Non-insulated fire doors (Class C)" classification; 
 Three pairs of fire doors to use the material requirements of a more comprehensive and specific, in addition to materials other than metal materials, an increase of the combustion of materials performance 

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