Activeforever RemRest 901 CPAP Machine - Manual (Page 5)

NOTE: Tier 1 model does not incorporate automatic altitude
compensation. In order to insure that this device provides the
expected pressures, the following adjustments to the pressure
setting must be made to the device:
For an increase in altitude, please multiply the prescription
pressure setting by the correction factor found in the table.
For a decrease in altitude, please divide the prescription pressure
setting by the correction factor found in the table.
RemRest 5
Altitude Change (+/- Meter) 457 914 1372 1829 2286 2438
Altitude Change (+/- Feet) 1500 3000 4500 6000 7500 8000
Correction Factor 1.05 1.11 1.16 1 21 1 27 1 32