Shark HE400 Anti-Allergen Hepa, with Advanced Odor Lock, Air Purifier 4 (HE401 & HE402), Grey, White

This Shark HE400 air purifier filter is a genuine replacement that works well according to reviewers. Customers note that the filter eliminates smells quickly, and that it's effective in filtering out air pollutants so much so that improvements in sleep quality are noticed. It fits the Shark HE401, HE400, HE402, and HE405 models and isn't too noisy. However, one downside is the price of the filter, which may be expensive to replace every six months. Another review noted that the manufacturer does not provide enough information on filter options or quality. Some found that the filter only lasts for a few months, while others found it to last longer. Finally, some reviewers note that the Shark HE400 filter is a bit pricey but worth it for its quality.