Think Crucial 3 Air Purifier Filter Designed To Fit all Blueair Brand 200 and 300 Series Models 201, 210B, 203, 250E,200PF, 201PF HIGH QUALITY AIR FILTER that can replace your Deluxe 200/300 Series Blueair Brand Air Purifier Filter. Get back to breathing clean air again. HEALTHIER LIFESTYLE No one wants to breathe in dirty air and if you don't clean your air filter that will be exactly what you'll be doing. Replacing your filter will help clean your air and allow for a healthier lifestyle This filter is designed to fit Blueair Brand 201, 210B, 250E, 270E ALL Blueair Brand 200 and 300 Series Air Purifiers. EASY TO INSTALL so you can get back to breathing clean air as soon as possible. Simply remove your old filter and put this brand new one in it's place.