This is a replacement HEPA Filter set compatible with Winix Size 17 ( 113050 ) P150 and B151 by LifeSupplyUSA. Any brand names or logos are the registered trademarks of their respective owners. This filter is absolutely essential for allergy sufferers designed to filter smoke, dust, pet dander, pollen, mold spores, fabric and other allergen airborne elements. Any use of any brand name or model designation for this product is made solely for purposes of demonstrating compatibility.