Honeywell Universal Air Purifier Carbon Filter, 8.33 in. is a versatile carbon pre-filter designed to capture large airborne particles before they reach the HEPA filter, effectively extending the life of your HEPA filter. This activated carbon pre-filter also helps to reduce common household odors, creating a fresher indoor environment. For optimal performance, it is to replace the filter every three months. This filter is compatible with all Honeywell QuietCare and Silent Comfort series air purifiers and serves as a for pre-filters Model No. 32002, 33002, 34002, 35002, and 38002. It measures 2 3/4 inches in width and 8 1/3 inches in length, making it a fit for your air purifier needs.