Filter Compatibility: Compatible with Honeywell HRF-H2 air filters. Model Compatibility: Replacement filters are compatible with Honeywell Tower Air Purifier Models: HPA-050, HPA-060, HPA-150*, HPA160, HHT-055, and HHT-155* (HPA-050, HPA-150, HHT-055, HHT-155 Air Purifier Series). *These models require two (2) filters. Air Quality Improvement: Filtration is rated H13 and removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust, smoke, pollen, pet hair and dander, and more. Maintenance: Recommended to change this filter once every twelve (12) months under normal conditions, and more often under harsh air conditions. Each package contains two (2) replacement filters. Approximate Measurements: Each filter measures 4.5 x 5 x 11 inches. Filter-Monster branded replacement for Honeywell Filter H (HRF-H2) removes smoke, dust, pollen, pet dander, mold spores and dust mite debris from the air.