Hollow wall soundproofing box, windproof, halogen-free, D=68mm, t=58mm, Innovative sound insulation for more relaxation and privacy. The installation of conventional hollow wall boxes in soundproof walls weakens the sound insulation considerably! With our innovative halogen-free soundproofing boxes, the structural requirements of the soundproof walls are maintained despite the installation opening. The sound is completely absorbed and thus guarantees peace and quiet in everyday life. The installation of our halogen-free soundproofing boxes is as uncomplicated, quick and easy as installing a conventional hollow wall box in a standard opening with a diameter of 68mm. The sound-insulating function of the wall is fully retained. Subsequent installation possible. 2K membrane introduction. Installation up to 5-way combination possible. Opposite installation possible from a wall thickness of 120mm. Milling hole d=68mm. windproof. Ideal for renovations and refurbishments in residential construction. Includes 5 connecting pieces type E105HF per unit. Material: PP, TPE, recyclable. Colour: white