This filter is absolutely essential for allergy sufferers designed to filter smoke, dust, pet dander, pollen, mold pores, fabric and other allergen air borne elements. Compare to FILTER B. This is an aftermarket product 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.