Carbon Replacement Pre-filter for Honeywell Model HPA090,HPA100,HPA104,HPA105 Perfectly fitted for Honeywell Model HPA090,HPA100,HPA104 & HPA105 Only. (Not come up with Universal Size). The pre-filter has a dimension (mm) Length 272 X Width 189 X Thickness 5. It is highly recommended that you measure your old carbon prefilter to see whether it matches with our size. No need to make any further cutting, it saves your effort and avoid messy jobs. Help to capture certain airborne germs, remove unpleasant odors and allergies. It has the ability to filter off a room size of around 155 sq.ft. Made up of nature material, high density coconut shell activated carbon.