The Germ Guardian FLT48252PK HEPA GENUINE Air Purifier Replacement Filter B comes in a pack of 2 black sheet filters designed for air purifiers. These filters use True HEPA filtration technology with fiberglass and carbon filter media to effectively capture airborne particles and improve indoor air quality. With a height of 17.8 inches and a model number of FLT4825, these genuine GermGuardian filters are a reliable option for maintaining clean and fresh air in your home.