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The tested fire doors were subjected to a standardized fire loading for an hour range. Results thus obtained are shown in Fig. 14 which, in particular, has been focused along the x-axis. Flame spread is clearly identified by heating elements within the furnace, which showed temperatures up to several hundreds of degree K. The orange color in Fig. 15 denotes the fire spread which is encountered at the door edges. The temperature about two meters distant from the door leaf edge is comparable with the room temperature recorded at 60 min (corresponding to initial condition). Therefore, decreasing scenario is expected at the door edges. Unfortunately, even at the beam edges, no decrease of heat conduction is experienced due to the presence of the fire-resistance layer which is the major factor preventing heat spreading towards the firedoor panel. The absence of transported heat could be regarded in terms of temperature rise, wherein lower values are measured in the presence of the fire-resistance layer on the door edge.
Fire is the leading cause of death and injury in the United States. One of the first steps to reduce the risk of fire exposure involves the implementation of suitable fire-resistant construction materials as well as fire-resistant doors. Generally, sliding fire doors can be classified into two groups: those made of fireproof materials (retractable, frame-less, and fire-resistance-rated), as well as those made of extruded fire-resistant profiles with low fireproofing properties (cold formable). For the urgent restoration of building conditions, also the use of non-retractile sliding doors is advisable. However, not all of the sliding door designs are suitable for retrofitting applications. However, generally, high fire-resistance doors should be capable of withstand extremely high temperatures in order to meet fire code regulations and also recommended standards issued by international organizations. As far as sliding fire doors are concerned, it is the edge zones that have the greater impact on the door's thermal performance on a long-term basis. Especially, door edge joints are subjected to high thermal stresses because of limited heat dissipation capacity. Hence, in the edge area, the thermal conduction is hindered by the fire-resistance coating, which exacerbates the temperature rise and may eventually cause the heat delaminations that eventually deform and potentially fail the door. d2c66b5586