Abstract: A low-frequency lung vibration apparatus is designed to vibrate lungs clogged by sputum, using acoustic waves. The freed sputum becomes easier to be removed by expectoration. The apparatus includes a garment composed of layers, a plurality of electro-mechanical or dynamic vibrators and a controlling unit. An inner layer contains a loading and shape conforming material, while an outer shell holds the vibrators, the controller and the inner garment together. An outer shell is made of a non-stretch material. Several fasteners/zippers hold the inner garment in place and several strategically placed straps allow a tight fit of the garment. The loading created by the layers of the apparatus is tailored to cause the existence of a uniform compression-expansion resonance of the lungs beneficial for sputum removal. A controlling unit allows the detection of a person's lungs resonance frequency and controls the vibrator(s) frequency and amplitude during a treatment.