3 filters in 1. Best-in-class filtration for every need. A revolutionary combination of the best in electrostatic and mechanical filtration, our air purifier replacement filters use. HEPASilent technology to remove 99.97% of harmful particles from the air. Highly efficient particle filtration can be combined with activated carbon filtration media to remove gaseous pollutants. Saves energy with super low energy consumption. Less dense filter media, which means lower noise levels. Designed for maximum removal of all airborne particles. The perfect choice for removing pollutants such as pollen, dust, pet dander and other particles you don’t want around. Particle filter with activated carbon for use in rooms where removal of heavy gaseous pollutants, such as tobacco smoke or volatile organic compounds (VOCs), is required. Blueair Classic 500/600 Series SmokeStop Filter targets tobacco smoke and odors. Filter Type: Blueair Classic Particle Filter; Filter media: Nonwoven gradient PP blend fibers and activated carbon pellets; Numbers of Filters: 1; Filter Frame Material: Paper; Filter Recycling: Plastic; Envelope: Honeycomb with carbon sheet cover; Dimensions (HxWxD): 330x235x69 mm mm; Surface Area per Filter: 4.2 m2. Not for sale to U.S diplomats or other U.S governmental institutions. Fits following Blueair air purifier models: 503, 505, 603, 650E, 605 & 680i.