Open box all items are inspected for new quality. The 400S Air Purifier Replacement Filter is a 2-pack of HEPA and activated carbon filters designed for the LEVOIT Core 400S air purifier. With a MERV rating of 13 and true HEPA filtration technology, these white filters effectively capture airborne particles to improve indoor air quality. Made with a durable plastic filter frame, this replacement filter is specifically designed for use in air purifiers to ensure clean and fresh air in your home. Easy to install and long-lasting, these filters are a reliable solution for maintaining a healthy environment.