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Experience cleaner air and improved air purifier performance with Hepacart Replacement Pre-Filters made from high-quality synthetic fiber. These filters effectively capture dust, pet dander, and other contaminants before they reach the HEPA filter, prolonging its lifespan and ensuring maximum efficiency. The natural color of these pre-filters makes them virtually invisible when installed in your air purifier, and their compatibility with popular models like HC55U, HC74U, and HC74UX makes it easy to find the right fit for your needs. With 12 filters included in each pack, you'll never have to worry about running out of pre-filters again. Upgrade your indoor air quality today with Hepacart Replacement Pre-Filters!