The Winix 113050 Replacement Filter Set C/Size 17 comes with all the filters required for 1 year of operation. This filter set includes 1 True HEPA filter and 4 carbon pre-filters. For optimal performance, it is recommended to change the True HEPA Filter once every 12 months and the Carbon Filter once every 3 months.

Designed for use with Winix Air Purifier units P150 and B151.

Approximate HEPA filter size is 13.2"(H) x 11"(W) x 1.2"(D)
Approximate Carbon filter size is 13.2"(H) x 11"(W) x 0.2"(D)