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?Save Money?Included 1 True HEPA filters and 4 carbon pre-filters, identical to the original ones but half the price. | ?Odor Free? With premium materials and advanced technology, smell-less and safe to use. | ?Easy to install?Take the filter out and then take a high power vacuum and vacuum the outside of the filter every 30 days. Quick and hassle-free installation, no cutting necessary, fits perfectly. | ?Perfect Fit? Compatible with Winix C535, 5300, 5300-2, 6300, P300 air purifiers, replace part# 115115. | ?Risk Free Guarantee? 6-months warranty! Please feel free to contact us if you have any issues.