What is an Auto CPAP machine? Auto CPAP machines are often referred to by many names such as Auto Adjusting CPAP, APAP, or Auto-Titrating; and what this means is the device is equipment with software that adjusts the CPAP pressure based on your specific need.AutoPAP typically has a minimum pressure range (i.e. 4 cm/H2O) and a maximum pressure range (i.e. 20cm/h2O) and the machine will provide variable pressure based on your sleep therapy needs when it detects airway closure and snoring. Auto CPAPs also have the capability to be set in fixed pressure CPAP mode.