Package includes:</br> 2 HEPA Filters and 8 Activated Carbon Pre-Filters</br></br> An ideal true HEPA air purifier filters replacement professionally designed for your Guardian Air Purifier Models AC5000 series, AC5250PT, AC5300B, AC5350W, AC5350B, CDAP5500B, PureGuardian Model AP2800CA, Black+Decker BXAP250 and Lowe's Idylis Model IAP-GG-125 </br></br> We suggest changing the HEPA filter after 8-12 months and the activated carbon pre-filter every 2-3 months or as needed.</br></br> This is not a Germguardian OEM product. Any use of the brand names or model designation for this product is made solely for purposes of demonstrating compatibility.