About this item Compatible with Aromacare #22901 Model Air Purifier for large room . Do not work with the other brands or models. Contains premium 3-in-1 H13 True HEPA filtration system includes Mesh Pre-Filter, H13 True HEPA Filter, and Activated Carbon Filter. Mesh Pre-filter traps larger particles in the air like dust, hairs, pet fur, lint and more; Activated Carbon Filter neutralizes household odors from pets, cooking, smoke, and harmful VOC's. H13 True HEPA Filter captures 99.97% of airborne particles down to 0.3 microns in size, creating fresh, purified air for you and your family. Easy to replace and disposable, no tools required. Replace every 6 months for optimal performance. 100% Satisfaction Guarantee. Specification Name:3-in-1 True HEPA Replacement Filter Size:Width141.5MM*Height141MM