Blueair Classic Particle 400 Genuine Filter, 2-pack

Features:

The gradient structure of Blueair filters traps particles of all sizes while maintaining maximum airflow. It resists clogging and won't re-release particles back into the air, even when the filter is heavily loaded. Blueair filter media is ultrasonically bonded to prevent filter fibers and other particles from being added back into your environment. The only thing that comes out of our filters is clean air! In addition, advanced polypropylene filter media removes particle pollutants down to 0.1 micron in size from your indoor air, such as pollen, dust, and pet dander. The Blueair Classic Replacement filter, Particle, keeps cleaning the air on average from 6 months to a year. The environment and fan speed will influence the actual life of the filter
First Layer: Larger particles such as dust and pollen are strained in the initial layer consisting of larger fibers.  In this stage particles are stopped and trapped by direct collision with the fiber.  Inertia also takes place in the First Layer which means heavier particles do not follow the airflow pattern around the fiber, but instead collide directly with it to be trapped.
Second Layer: This layer consists of a finer fiber material that collects smaller particles such as bacteria and allergens.  This filter intercepts what escaped the first layer.
Third Layer: In this layer, small particles such as viruses, smoke, carbon, and exhaust particles are filtered out.  This layer consists of fine thin fibers, as small as 0.5 micron.  Minute Particles enter this layer with a negative charge and easily adhere and stick to the fibers capturing particles as small as 0.1 micron at 99.97% efficiency

• 2 total filters (2-pack, 1 year supply)
• Replace filters every 6-months
• Polypropylene filter media filters out allergens, pollens, mold spores, dust mites, pet dander, bacteria, and viruses
• Filter design resists clogging and continues filtration at peak performance levels longer as it moves air more freely through unit and filter