The Winix 115115 Replacement Filter Set A/Size 21 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 6300, P300, 5300, 5300-2, 6300-2, and C535.

Approximate HEPA filter size is 16.4"(H) x 12.5"(W) x 2.5"(D)
Approximate Carbon filter size is 16.4"(H) x 12.5"(W) x 0.7"(D)