This is a high quality replacement HEPA air purifier filter Compatible with GermGuardian Models FLT-4850PT FLT-4825, AC4850. This filter is absolutely essential for allergy sufferers designed to filter smoke, small particles of dirt, pet dander, pollen, lint, fabric and other air borne elements. Compare to FILTER B. By LifeSupplyUSA, exclusively for sale by LifeSupplyUSA. This is not a GermGuardian OEM product. The GermGuardian brand names and logos are the registered trademarks of their respective owners. Any use of the GermGuardian brand name or model designation for this product is made solely for purposes of demonstrating compatibility.