Holmes
Carbon activated Prefilter
This odor-reducing carbon prefilter fits all Holmes air cleaners that require a carbon prefiter. Simply cut the 16"x 48" filter sheet to match your existing prefilter size with household scissors. makes 1 to 6 prefilters depending on the model.
Activated carbon pre-filters help remove large particles from entering and clogging your HEPA filter. The impregnated carbon helps reduce common household odors such as cooking odors, tobacco smoke odors, pet odors, musty odors, etc.
It is recommended to replace pre-filters every two to three months, depending on use. | 
