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Honeywell Universal Replacement Carbon Prefilter 38002. These are new and have not been used. Model # 38002 replacement universal carbon prefilter helps reduce common household odors and traps more dirt particles than standard carbon filters, therefore, maximizing hepa filter life. Replace approximately every 3 months. The 38002 replaces the following pre-filters.15.5 inches x 46.5 inches. Honeywell universal replacement carbon prefilter 38002 air filters. Makes 1-3 pre-filters depending on model.