• Genuine OEM column pair- the sieve beds that strip nitrogen from room air to produce concentrated medical-grade oxygen.
• Replace at the manufacturer's recommended interval (typically every 12–18 months of daily use, or when the concentrator alerts you to a low-oxygen concentration).
• Using non-OEM columns can void the warranty and reduce oxygen purity- always use genuine Inogen columns
.
• User-replaceable in about 5 minutes with the included instructions.
