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Winix Size 21 Ultimate Washable True HEPA Filter Cassette Set

Winix Size 21 Ultimate Washable True HEPA Filter Cassette Set

Prices as of September 26, 2026, as listed by each retailer — verify the current price on the retailer's site before purchase.

Price history tracked at Kohl's price tracker

14-day low
$119.99
Sep 13 · Kohl's
Best price
$119.99
−0% vs high
14-day high
$119.99
All stores
$120$120$120
Sep 13Sep 26
  • Kohl's
Lowest in 14 days: $119.99 at Kohl's. Highest: $119.99. Current best is 0% below the 14-day high.

About this product

The Winix Size 21 Ultimate Washable True HEPA Filter Cassette Set is a replacement filter kit designed for select Winix air purifiers. It includes a True HEPA filter, a washable pre-filter, and a washable carbon filter. Together, these components capture airborne particles as small as 0.3 microns and help eliminate odors from pets and household sources. The set is engineered to last up to one year with regular use and fits multiple Winix models including the U300, P300, and WAC series units. Measuring 17 inches in height, 14 inches in width, and 3 inches in depth, it ensures consistent indoor air quality through efficient filtration.

  • True HEPA filter captures 0.3-micron particles
  • Washable pre-filter and carbon filter
  • Lasts up to one year
  • Fits Winix U300, P300, WAC series
  • Removes pet and household odors
  • Dimensions: 17H x 14W x 3D inches

Based on 7 reviews at Kohl's

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Winix Size 21 Ultimate Washable True HEPA — Price History