The FF M10 is a stack system with a filling height of 120mm. The 120mm should always be filled up, either with just filters or a combination of filters and fillers.
Thin P1 Filter
Due to the low filling capacity of the M10 unit, the P1 filter will be void with a carbon/P3 combination.
To fill up the unit, a carbon filter or a filler can be used.
Pollution of dust only
Pollution of dust and vapours