Replacement Air Filter for Philips Respironics EverFlo Oxygen Concentrator. It is recommended to change the EverFlow Filter every 3-6 months to maintain the proper working order.
eBay
The SUNSET HEPA Everflo Intake Filter BF1001 is designed for use with Respironics Everflo 1038831. This filter is a unit type capsule filter manufactured in China. The package includes 2 units of the filter, providing efficient filtration for the Respironics Everflo oxygen concentrator.
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7L Oxygen Respirator Generator 24hours Continuous Flow Household Oxygen Concentrator Bar110V 220V
Aliexpress UK
COXTOD Brand 2L-9L Portable Oxygen Concentrator Low Operation Noise Oxygen Generator Home Care
Aliexpress UK