A noninvasive ventilator that helps people breathe by delivering pressurized air through a mask on their face. The machine adjusts the air pressure based on whether the patient is inhaling or exhaling, providing higher air pressure when they breathe in. BiPAP machines are used to treat a variety of medical conditions that make it difficult to breathe, including: Chronic obstructive pulmonary disease (COPD) Obstructive and central sleep apnea Obesity hypoventilation syndrome Pneumonia Asthma flare-ups Poor breathing after surgery Neurological diseases that affect breathing Congestive heart failure