UOUOLONUN 4 Sets HAPF30AT Blue True HEPA Filter Replacement for Holmes Air Purifier Models AER1 Series, HAPF300AT for Replacement Parts # HAPF300AH-U4R, HAP242-NUCPackageAIncluded:AA 4APackAHEPAAFiltersAA FeaturesA compatibleAwithAAairApurifierAUnits:AcAP531-U,AcAP529-U,AHAP240,AHAP242,AHAP412,AHAP422,AHAP424,AHAP706,AHAP716,AHAP9240,AHAP9242,AHAP9..