Inogen One G4 Intake Particle Filter
The particle filter covers the air intake screen and filters out dust, pet hair, and other airborne contaminants. The filter is removable and should be washed and dried weekly to keep the concentrator working properly. The filter should be replaced when it becomes misshapen or the screen is damaged. Some Inogen One G4 users like to keep a spare filter so that one is always available, even during the weekly wash period.