What is the difference between the Z1 or Z2 Auto and the Z1 or Z2 CPAP?

A fixed pressure CPAP device provides a constant therapeutic pressure. The prescription is written as a single pressure such as 12 cmH2O.

An Auto adjusting CPAP provides a variable therapeutic pressure throughout the resting period. The prescription for is written as a range of pressures such as 4-20 cmH20. The therapy will start at the lowest set pressure and then increase as it senses resistance.