Honeywell HEPA air purifier filters are able to capture an impressive 99.7% of airborne particles at 0.3 microns from the air that passes through the filter. This package includes 1 Honeywell H filter. This HEPA filter is compatible with the HPA050 series, HPA060 series, HPA061 series, HPA150 series, HPA160 series, HHT055 series and HHT155 series. It is highly recommended that you change this hepa air filter once a year for optimal performance. Establish an unrivaled breathing experience for yourself and your loved ones with Honeywell HEPA filters.