Replacement Pre-filters - 2 Pack - Compares to Hunter 30901 (2 Pk) Replacement for 30901, 30903, 30907, 30958, and 30959. Fits HEPAtech, QuietFlo, and PermaLife Models Large 16" x 30" cut-to-fit activated carbon sheet! Cut-to-Fit activated carbon pre-filter helps remove large particles and reduce common household odors.