Filters-NOW RZ14ALL=RAC Family Care Air Purifier Carbon Pre-Filters Fits all Family Care room air cleaners that require a pre-filter. Large 15-3/4 x 48 cut-to-fit activated carbon sheet! Helps remove large particles and reduce common household odors such as cooking odors&#44; tobacco smoke Makes 1 to 6 pre-filters depending on the model. Saves money! For optimum performance replace pre-filter every 2 to 3 months.