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ULPA is an acronym for "Ultra-low Penetration Air (filter)". A ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (0.12 µm, ultrafine particles). A ULPA filter can remove (to a large extent, not 100%) – oil smoke, tobacco smoke, rosin smoke, smog, insecticide dust.
It can also remove carbon black to some extent.
Some Fan filter units incorporate ULPA filters.