Nispira EF Intake Replacement Filter Compatible with EverFlo 5L Oxygen Concentrator, 4 Pack

["Designed for compatibility with standard 5L oxygen concentrator systems, including EverFlo style units, for proper fit and stable operation.","Installed at the air inlet to help limit dust entering the unit during regular use, supporting consistent airflow.","Constructed with a rigid plastic outer housing and internal filter layer to maintain shape and structural stability over time.","Measures approximately 4.76 x 2.36 x 1.93 inches (L x W x H) with an inlet diameter of 0.87 inch outer and 0.79 inch inner; please verify size before purchase.","Simple drop-in design allows quick replacement without tools, making routine maintenance more convenient.","Regular replacement helps maintain airflow performance and supports long-term use of compatible equipment."]