MODEL COMPATIBILITY: The Filter-Monster kit includes a genuine high-quality H13 filter and pre-filter that is compatible with the Aeris Aair Lite air purifier. Advanced Filtration Technology: The MERV 13 filter captures up to 99.97% of particles sized .3 to 10 microns, including common irritants like dust, pollen, mold spores, pet dander, and lint Dual-Stage Filter System: The pre-filter traps larger debris, helping to extend the life of the H13 filter and maintain your purifier’s optimal performance. REPLACEMENT TIME: Depending on air quality environment and usage, it is recommended to replace the filter every nine (9) months to help ensure the air purifier is running efficiently Dimensions: H13 filter: 8" Tall Top Diameter 9.06" Bottom Diameter 7" Pre-Filter: 3.81" Tall Diameter 9.5"