BiPAP is a compact, easily operated device that helps a person with COPD to breathe freely. While using a BiPAP machine, a person takes in pressurized air through a mask to regulate their breathing pattern while they are asleep or when their symptoms flare.BiPAP (also referred to as BPAP) is short for Bilevel Positive Airway Pressure and this machine has a very similar function to CPAP machine therapy.BiPap is only one type of positive pressure ventilator. When you use a BiPap machine, you will receive positive air pressure when you breathe in and when you breathe out.