(1)The air filter is located at the back of the oxygen concentrator. Pull the filter out and
remove the filter sealing ring. (As shown in Fig. 10).
(2)The air filter shall be replaced at a time interval which shall be determined according to the actual service time and environmental impact.
(3)The air filter shall be replaced immediately regardless of its service time as long as the surface turns black.
Installation of the new air filter.
Take out the new air filter and place the sealing ring into the air filter, then press it on the corresponding location of the oxygen concentrator with appropriate force.