BiPAP ST30 (Bilevel Positive Airway Pressure) Four-in-one noise reduction technology 2.8 inch TFT screen With 4-30 cmH2O Pressure range and 220ml water capacity. Ds-8 Ventmed Bipap Machine for Sleep Apnea Treatment. Ventmed Positive Airway Pressure (BiPAP) may improve breathing in people who suffer from breathing impairment.