1 Filter to fit Blueair 200 & 300 Series Air Purifiers. This replacement air particle filter is a compatible replacement for Blueair models 201, 203, 203C, 205, 205C, 210B, 250E, 270, 270E, 303, and other 200/300 Series models. Part # 200PF, 201PF. It is compatible with all Blueair 200 Series Air Purifiers as well as the Blueair 303 Air Purifier. The dimensions of this air filter are 18 3/4" x 14 3/4" x 2 1/4" - please check the size compatibility with your old filter before purchasing this one. This is a high quality replacement part. Designed & Engineered by LifeSupplyUSA exclusively for sale by LifeSupplyUSA. This is an aftermarket product designed and engineered in the United States by LifeSupplyUSA. Any brand names or logos are the registered trademarks of their respective owners. Any use of any brand name or model designation for this product is made solely for purposes of demonstrating compatibility.