The Blueair 203 is an ideal choice for bedrooms, offices or any indoor space up to 240 square feet. With certified results through independent testing, this tiny wonder will have you breathing cleaner, healthier air in no time. For certified testing and results, the Association of Home Appliance Manufacturers (AHAM), tests the CADR, which is the amount of clean air produced by the air purifier and the rate at which it is produced. The results determined that Blueair has the highest Clean Air Delivery Rate (CADR) available. An airflow pattern that flows from back to top, the Blueair 203 delivers big performance to small spaces. It’s compact enough to fit along an interior wall or in a corner. Just keep in mind that for maximum airflow, your unit should always be more than four inches from the wall. Capturing 99.97% of airborne particles down to 0.1 microns in size, Blueair’s HEPASilent® technology uses a unique combination of electrostatic and mechanical filtration. With advanced filter media and an encapsulated ion particle charging chamber comes results superior to either mechanical or electrostatic filtration alone. Getting the performance you expect means maintaining your unit. For cleaner, healthier air you can trust, be sure to change your filter at the right time. Included is a magnetic timer to alert you when your filter needs changing. Simply attach the timer to your air purifier, refrigerator, or anywhere else that will help you remember when it’s time for a change. Plus, the 203 offers easy filter access for simple filter changes anytime by simply opening the door and replacing the filter, no tools necessary. The Blueair 203 air purifier has a compact fan design to expertly handle high-pressure airflow, even for long periods of time. Weighing in at 25 lbs, the lightweight 203 has a convenient handle, so you can move your air purifier around your home with ease.