This 600 series smoke stop air filter is the perfect choice for removing pollutants such as pollen, dust, pet dander, mould spores, viruses and bacteria. The large filter surface area prevents premature clogging and ensures a long life whilst also ensuring a high clean air delivery rate (CADR) at the lowest possible noise and energy consumption. The airborne particles pass through the air purifier to get electrically charged before passing through the gradient structure of the filter. The charge causes the polluted particles to stick to the filter, capturing even the finest of particles such as tobacco smoke. Due to the use of both electrostatic and mechanical filtration, the filter is less dense, ensuring air moves through the filter at a lower pressure, so you get high performance with whisper-silent delivery of clean air. The air filter will last 6 months (4380 hours of use) before needing to be replaced and are also recyclable.