Restock or change up your filter game with the Honeywell Filter H HEPA Air Filter and Filter B Home Pre Filter 2 Pack.Honeywell Filter H True HEPA Air Filters are great for capturing contaminants that can come up in your home. Honeywell HEPA Filters are able to capture 99.7% of airborne particles at 0.3 microns from the air that passes through the filter. Absorbing common household particles, these Filter H replacement filters will capture those large pesky particles that can make breathing and allergies difficult. It is recommended that you replace your filter every year for top filter performance. Honeywell Household Odor and Gas Reducing Pre-filters are great for capturing harmful gasses such as ammonia and other volatile organic compounds that can come up in your home. Honeywell Pre-Filters are also great well for deodorizing the air and reducing odors with its activated carbon and zeolite qualities. Absorbing common household gasses and fumes, these Pre-Filters will capture large pesky particles. It is recommended that you replace your filter every 3 months for top filter performance.