The Filtrete 14x14x1 Ultra Allergen 2X Bacteria and Virus Filter is a high-quality air filter that helps improve indoor air quality. With a MPR (Microparticle Performance Rating) of 1600, this filter is designed to capture allergens, bacteria, and viruses, providing cleaner and healthier air for your home. The 14x14x1 size is suitable for most standard air conditioning and heating systems. This pack includes 4 filters, ensuring you have replacements on hand when needed. Trust Filtrete for superior air filtration and a healthier living environment.