Aftermarket Replacement Compare to Hunter 30901 replacement pre-filters (2 pack) (2*30901) Replacement for Hunter Model 30901, 30903, & 30907 Dimensions: 16" X 30" Includes 2 cut-to-fit carbon pre filters Made from BulkFilter Brand Carbon filters Lightweight and easy to install (simply trim the filter to the height of your machine) Helps remove large particles and reduce common household odors