HAPF600PDQ-U. Helps remove 99.97% of particles as small as 0.3 microns from passing through the filter. Captures unpleasant odors and common allergens. Maintains consistent high performance over time. Replacing the HEPA filter at least once a year is recommended. Filter Type: HEPA; Filtration For: Dust; Mold Spores; Odors; Pet Dander; Pollen; Smoke; Air Cleaner Compatibility: HAP-726-U; HAP-756-U; Quantity: 1 each.