ANTI-ALLERGEN HEPA MULTI-FILTER: Shark’s Anti-Allergen Multi-Filter captures 99.97% of dust, dander, allergens, smoke, and household odors. Based on HEPA filtration standards of 99.97% filtration, down to 0.3 microns. HEIGHTENED ODOR PROTECTION: An advanced odor guard on the filter protects against household odors from cooking, cleaning products, and more. Compatible with Shark Air Purifier 4-Fan Models (HE401, HE400, HE402, HE405). Replace filter every 6 to 12 months.