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DerBlue Replacement True HEPA Filter Compatible with Holmes AER1 Series Including 4pcs Filters and 8pcs Pre Filters Replacement Parts # HAPF300AH-U4R, HAP242-NUCDerBlue Filter Replacement Set: Including 4pcs Filters and 8pcs Pre Filters, HAPF300AH-U4R.Filters advantage: Evidently improves the air quality. Filter removes unfavorable household smell ..