Hinge ued in fire rated doors

- Jul 10, 2019-

Steel and wooden fire rated door both have hinges.But the quantity of hinge used in one door is different.If the leaf width big than 1.2M and the height more than 2.3M,will be uesd 4 pieces hinge.Height :1.9-2.3m will use 3 pieces,less 1.9m,will use 2 pieces.Our hinge mainly have 4.5X4.5X4 and 4.5X4.5X4.5.the thickness is 3.4mm.the type has bearing,spring,etc.