Designed to work with Shark Air Purifiers: HP201, HP202 & HP232 ANTI-ALLERGEN True HEPA Filter: Shark’s filter with true HEPA captures 99.98% of large, small, & micro-sized particles (based on IEST-RP-CC007.3, 0.1–0.2 microns). HEIGHTENED ODOR PROTECTION: An advanced odor guard on the filter protects against household odors from cooking, cleaning products, and more. Replace filter every 6 to 12 months.