Fire-resistant door for electrical drainpipe of gas, telecommunications, is formed by metallic framework with one of side of framework consist by profiles in Z-shape and presented in external face fins, where internal face is provided

摘要

The door is formed by a metallic framework and is metallic door with one of the side of the framework consist by profiles in Z-shape and presented in external face fins. The internal face has a strip or joins swollen, which supports the door and provided in the internal face of an insulating plate. The insulating plate is retained by eyelashes folding manually placed in the in the cavity, which conforms the door. The closing media step are provided, which are activated to turn and remained block against the flap of the framework.