The lasko yy25610 replacement filter pack is designed to fit and work with the lasko hf25610 pure silver air purifier.Filter pack contains 1 pleated filter, 3 carbon filters and 4 hook and loop straps.Pleated filter last up to 12 months and carbon filters last up to 4 months for a 1-year filter supply.2-stage filtration system carbon filter removes smoke, cooking and household odors; captures dust, dog and cat hair and other large particles, helps extend pleated filter life.Pleated filter removes up to 99 percent of airborne irritants such as pet dander, pollen, dust mites, and other allergens down to 0.3 microns.Ideal for allergy & asthma sufferers ? when used with a lasko pure silver air purifier, the system makes living space more comfortable by reducing pollutants that contribute to poor indoor air quality.Cleans air fast ? when used with a lasko pure silver air purifier, filter cleans the air in a 12? x 12? room in less than 10 minutes, up to 7x per hour; and a 15? x 15? room in less than 15 minutes and up to 4x per hour; making it ideal for bedrooms and living rooms.Clean air delivery rate ? cadr is a way to compare the amount of clean air from air purifiers and represents the amount of clean air coming out of an air purifier at the highest fan speed.Independently tested by aham verifide, based on a suggested closed 161 sq.Ft.Room, the lasko hf25610 produces a cadr of 104 for smoke, 125 for dust and 130 for pollen.1-year supply ? filter pack comes with 1 pleated filter that lasts up to 12 months and 3 carbon filters that last up to 4 months each."