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603 Model Blueair Air Purifier - Make The Air In Any Office Or Small Room Quietly Clear Of Allergens. Blueair is the system for people living with allergies, asthma, or other respiratory conditions, or for anyone who wants cleaner, more breathable air. The 603 Model effectively purifies air in rooms as large as 680 square feet (at 6 air changes per hour). Using patented two-stage HEPASilent technology, it captures 99.97% of the tiniest 0.1 micron particles on level one, including allergy-provoking pollen grains, as well as dust mite, mold spore and pet dander particles. The efficient SurroundAir vent system delivers exceptional air exchange (up to 530 cubic feet per minute) without annoying drafts. You'll also sleep better knowing that your Blueair uses very little energy, earning it the coveted Energy Star rating.