Blueair ECO10PF Replacement HEPASilent Particle Filter HEPASilent particle filter for the Blueair ECO10 air purifier Traps 99.97-percent of airborne allergens down to 0.1 micron in size Made of nontoxic polypropylene; 100-percent-recyclable filter media Resistant to bacteria, viruses, and mold; replace every 12 months Measures approximately 8-1/2 by 9-1/2 by 13 inches