Bilevel positive airway pressure or BiPAP devices is generally a type of non-invasive ventilation therapy for better breathing. You can use these devices in hospitals, but anybody in need can also use them at home. Machines for home are more compact and don't occupy much space. The reason behind designing these devices is to double the pressure while one inhales to keep the nose and throat airways open. It is also preferable for patients suffering from congestive heart failure and severe disease that affects lungs & hearts.