HEPA Filter Replacement
Airpro mask HEPA filter needs to be replaced when the air volume is less than 70% or if it's dirty.
The HEPA filter should be replaced after 500 hours of use. When installing the HEPA filter, the protruding tab must point upward, otherwise the HEPA filter will not fit
Replace the HEPA filter:
Power off, Open the cover, take out and replace the HEPA filter.