What is a BiPAP or BiLevel machine?

From: http://www.cpap.com/cpap-faq/New-CPAP-User.html
Time: 2016-01-06
Summary: What is a BiPAP or BiLevel machine?
A BiPAP machine (also referred to as BiLevel or VPAP) delivers two separate and distinct pressures. A higher pressure is need for inhalation, while a lower pressure is needed for exhalation. The machine alternates between the two pressures which are set per the doctor's order or prescription. A prescription for a CPAP machine may not be used to purchase a BiPAP machine. 

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