Honeywell Air Purifier Replacement Pre-FilterThis genuine Honeywell HEPA filter R is extremely efficient in capturing the following microscopic allergens like pollen, dust, smoke, pet dander and dust mite debris (1). This filter fits following models series: HPA050 series, HHT055 series, HHT155 series, HPA 051C, HPA060C, HPA 151C, HPA160C. From the air that passes through the filter, 0. 3 microns and larger, results based on independent testing. Overall particle reduction depends on many factors