Size 21 — One Year Replacement Filter Set: 1-True HEPA + 4 Carbon Pre-Filters - The 21 Combo Replacement Filter
- Helps to Filter up to 1 Year
- Pre-Filters Support Odor Control
The 21 Combo is exactly what the doctor ordered. The replacement filter is compatible with the Winix MODEL # 5300,5500, and 6300. Included in the combo is a 99.97% True HEPA filter and 4 Activated Carbon Pre-Filter to support odor control. The 21 Combo provides filtration for up to 1 full year. | 
