This 1 micron cellulose cartridge filter is included with the non-HEPA vacuums and is preferably used for dry vacuuming. A cartridge filter must always be used to prevent motor damage and dust inhalation. After wet vacuuming, allow the cartridge filter to dry, or replace it with a dry cartridge filter. Dry vacuuming with a wet cartridge filter will ruin the filter.
This item will not work with prior versions of the Fein Vacuums.