The Lasko YY350 HEPA Replacement Filter Pack is designed to work with the Lasko LP300 and LP450 Tower Air Purifier models. Filter pack contains 3 activated carbon filters and 1 HEPA filter and will last up to 1 year. Indoor air is dirty. Lasko makes it clean. The 2-Stage Filtration process protects your home from 99.97% of the top airborne irritants common in most home environments. Our Total Protect Filtration process protects your home from most common airborne irritants, including allergens, smoke, odors, VOCs, pet dander, pollen, and dust. The Activated Carbon filter removes smoke, VOC, cooking, pet and other household odors. The HEPA filter captures 99.97% of airborne irritants such as pet dander, pollen, dust and other allergens down to 0.3 micron diameter.