- Compatible Models: Includes 3 pack of 500/600 Dual Protection Replacement Filters for Blueair Classic 500/600 Series air purifiers (models 501, 503, 505, 510, 550E, 555EB, 580i, 601, 605, 680i). Note: Please confirm your air purifier model before purchase. - Dual Protection Filter: Classic 500/600 Series filter with a Dual Protection Filter System combining an H13 true HEPA layer and an activated carbon layer. Durable construction aims to extend filter life and maintain fresh air. - H13 True HEPA Filtration: Captures 99.97% of particles as small as 0.3 microns, including pollen, dust, and pet dander. Activated carbon reduces smoke, cooking odors, pet odors, VOCs, and other household smells. - Easy to Replace and Install: Remove the old filter and install the new Classic 500/600 Dual Protection Replacement Filter. The HEPA side should face the fan when replacing (the package notes “Facing in” on top). Recommended replacement every 6 months depending on usage. - Practical Uses: Ideal for allergy relief and pet households; effective in reducing cooking and smoke odors; suitable for maintaining clean air in rooms using Blueair Classic 500/600 purifiers.