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HAPF300AHD-U4R True HEPA Filters Replacement for Holmes AER1 Air Purifier, Parts # HAPF300AH-U4R, HAP242-NUC, 4 True HEPA + 8 Pre Filter4 Pack HAPF300AHD-U4R-2 True Hepa Replacement Filter for Holmes Type Total Air Filter plus 8 carbon filters, , Holmes Air Purifier Filter AER1 SeriesAA Product Size: 10 x 46 x 12 inchA compatible with Holmes cAP531..