Hamilton Beach® True Air® Compact Air Purifier. Quiet operation. Permanent 99% HEPA-grade filter saves up to $49 a year. High-performance HEPA-grade filter captures dander & airborne particles as small a 3 microns. Permanent HEPA-grade filter vacuums clean. Use it horizontally or vertically. Effective performance for large 160 square foot rooms. 3 speeds.