HRF-B2 It's also a particle filter, designed to capture larger particles like dust, lint, and pet fur. The Honeywell/Kaz Household Odor & Gas Reducing Pre-filter, model HRF-B2, uses activated carbon and zeolite to capture odors and freshen the air. It helps absorb some common household gases and fumes. For optimal performance, replace the HRF-B2 filter every 3 months.
HRF-B2 includes two pre-filters.