This one-year ultimate replacement filter set includes washable pre-filter, true HEPA filter, washable Advanced Odor Control Granular carbon filter and is treated with CleanCel Anti-Microbial coating. It is the standard replacement filter for the Winix U450 Signature Air Purifier and also Winix FresHome P450 HEPA Air Purifier.

This filter lasts for one year and should be replaced annually, in addition to washing the pre-filter every 3 months. The carbon filter can also be washed as needed.