1-3 weeks The 5N11 filter cotton cannot be cleaned. If the breathing resistance increases significantly or becomes dirty, it needs to be replaced if damaged. The filter box is recommended to be used for 200 hours. During the correct wearing and use process, no harmful smell can be smelled. Whenever you smell a harmful smell, it may indicate that the filter box has been saturated with adsorption. Please leave the work area immediately and go to an open place to replace the filter box.
