The Winix 114190 Replacement Filter Set B/Size 21 comes with all the filters required for 1 year of operation. This filter cassette includes a CleanCel antibacterial cleanable pre-filter, a true HEPA filter, and a washable AOC Carbon Filter. For optimal performance, it is recommended to change the all-in-one cassette once every 12 months. This cassette is sold as one unit and individual components cannot be purchased separately.

Designed for use with Winix Air Purifier units 9500 and U300.

Approximate filter size is 16.4"(H) x 12.5"(W) x 2.5"(D)