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一种适用于地下非煤矿山大巷道的防火门(如图所示)能经受最高温度121℃的火焰1.5小时之久。经美国矿业局检验过的这种防火门为推拉摆动式,有两扇门页。由于用架空连杆机构连接,
A fire-rated door (shown) that is suitable for large underground tunnels in non-coal mines can withstand a maximum flame temperature of 121 ° C for 1.5 hours. The fire door, tested by the US Department of Mines, is a push-pull swing with two door leaves. Due to the overhead connecting rod mechanism,