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GermGuardian FLT4010 High Performance Allergen Filter A is a combination filter. The filter reduces dust and allergens down to .3 microns such as household dust, pet dander and pollen. It is recommended to use with the GermGuardian AC4010, AC4020 and Black+Decker Model BXAP040. The use of this genuine Guardian Technologies replacement part will maintain the product's performance.