The fire - endurance limit of Class B fire - rated doors is 1 hour, that of Class C is 0.75 hours, and that of Class D is 0.5 hours. Fire - rated doors of different levels vary in materials, structures, and manufacturing processes. Generally, the door panels of fire - rated doors are filled with fire - proof and heat - insulating materials, such as rock wool, which can effectively slow down the transfer of heat. Whether at which fire - resistance level, TINNO Di nuo System Entrance Doors are always meticulous in material selection and process improvement to ensure that the fire - prevention performance meets the standards.
When choosing an entrance door, an appropriate fire - resistance rating should be determined according to actual needs and building requirements. Especially for high - rise residential buildings, commercial buildings, and other densely - populated places, entrance doors with higher fire - prevention performance should be selected. TINNO Di nuo System Entrance Doors have become the premium choice for numerous places with their reliable fire - prevention performance. At the same time, attention should be paid to the quality certification of fire - rated doors. All TINNO Di nuo System Entrance Doors have passed strict quality inspections, ensuring that the products purchased truly meet the fire - prevention standards. Understanding the fire - resistance rating knowledge of entrance doors and choosing TINNO System Entrance Doors can provide us with an extra layer of safety protection when facing a fire.