Grade of fire access doors !

Fire doors can be divided into class A, class B and class C according to grade:

Class A - heat insulation fire door in the specified time, can meet the fire integrity and thermal insulation requirements of the fire, filling material for more than 43mm perlite fire board can meet the A fire standards;

Class B -- part of the insulation fire door filling material for 35 ~ 37mm perlite fire board can meet the standard of class B fire.Within the specified time of 0.50 h or less, meet the requirements of fire integrity and heat insulation;Fire doors that can meet the requirements of fire integrity within the specified time after more than 0.50 h;

Class C - non heat insulation fire door in the specified time, can meet the requirements of fire integrity of the fire door, filling material 28 ~ 30mm perlite fire board to meet the C class fire standards.