Holmes Bionaire GE Replacement Carbon Filter HAPF60, HAPF60PDQ-U, A1260C 8-Pack Our high quality aftermarket charcoal pre-filters help remove household odor, pet odor, smoke odor, dust, pet hair, lint, dust mites & pollen, which will help to extend the life of your Hepa Filter. TWO -4 Packs -Brand new in original packaging -Measures 6 x 9-1/4 x 1/4 -Replace every 2-3 months for optimum performance