The internal range. With fire package, fire retardant package do wall, replacing the past with bricks, slag wool, ceramic fiber and other materials, compared with them, fire package, fire retardant package has a significant thermal insulation. Fire package, fire retardant package for electric power, telecommunications, postal services, chemicals, industrial and mining enterprises, construction of which, cables, tubing, duct, pipe, metal pipes, etc. through the material passes through the wall formed by the living compartment empty closure. Prevent the spread of flame, especially for frequent replacement of important parts of the cable. Construction method: cable shaft, with resistance Fire, fire partitions or iron do support pad, the fire package, fire retardant package tile on the mat, Lei Cheng compartment, cable tunnel