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Blog2025-01-16T11:26:47-07:00

Sleep Blog

Read the latest tips, news, and information about The Insomnia and Sleep Institute of Arizona.

What Is EPR on CPAP?

October 5th, 2026|

Expiratory Pressure Relief or ERP is a comfort feature on ResMed CPAP devices that lowers the pressure when you breathe out, making exhaling feel easier (1)(2). While standard continuous positive airway pressure delivers a single fixed pressure across the entire breathing cycle (3), EPR softens exhalation resistance so breathing against the machine feels natural and relaxed. How EPR Adjusts Your Breathing Cycle Standard CPAP therapy delivers constant airflow to keep your upper airway from collapsing. While inhalation usually feels effortless, exhaling against incoming pressure can