Abstract: An electromagnetically compatible vertical enclosure for the operating system of transmission equipment, in particular for transmission by radio beam, the enclosure containing a set of electrical modules and having a top flap and a bottom flap for closing said structure. The flaps are removable and are hinged at the top and at the bottom of the structure about horizontal axles fixed to the structure, thereby making it possible to provide completely unhindered access to the modules. The invention is particularly suitable for radio beam transmission.