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Soundproof ventilation solutions

If the door is intended to provide for air exchange between adjacent rooms but also has to be soundproof then we can offer an optional extra of a sound-proof ventilation profile installed at the top of the door and having the sound insulation value of Rw28dB (can be installed only to straight-edged doors), or an acoustic door grille for transit ventilation mounted inside the door-leaf and having the sound insulation value of Rw32dB.