Ultra Clean Air Purifier Superior Air Cleaning. Cleans Room Sizes up to 19 x 18. Quiet Operation. Easy Filter Change. Filter Change Indicator. 3-Speed Fan. Streamlined Design This portable room air purifier from 3M® features a modern streamlined design which takes up less room, looks great in any decor, and runs quietly. This Filtrete™ Ultra Clean Air Purifier offers 25% more air circulation and a 35% higher dust and pollen capture rate than a comparable HEPA Air Purifier for rooms 350 sq. feet. or less. The filter captures 99.9% of large airborne pa.