CATV SD 400 with dimensions 400x300x150. Box on its periphery is equipped with a collar, which make it easier to assembly casings in f.e. gypsum board - cardboard or styrofoam. The body of the casings is then in the ground and only outer wall is visible with a door and / in the collar. CATV SD 400 (box) with dimensions 400x300x150. Interior door, locked with locking patent one-point, a wooden mounting plate, not permanently connected to the housing - which simplifies the process of assembly in a workshop for example, do not have a hinge - the doors are opened until the ultimate angle, making it easier to manipulate inside the box, sealing the holes in the door. It has four holes for the mounting slat - one in each side wall. Openings if not used may be covered with metal cap, available separately.