Why Blueair Replacement Filters work so Efficiently to Purify your air.

Blueair HepaSilent™ Filter Technology features the Blueair Progressive Filter. The Blueair Replacement Filter with the highly efficient Pre-Filter, traps six times more dirt and particles than many other air purifiers. This is because of Blueair’s progressive filtration. Most other filters have a thin layer of different size fibers throughout the filter. Blueair filters have millions of ultra thin fibers in three progressive layers. This Progressive Filter design resists premature clogging, these filters are made from a network of hypo-allergenic fibers. This design permits much longer, continuous filtration at peak levels. Because of this filter design air flows more freely through the filters. This is why Blueair units deliver more clean air at a faster rate with less noise than any other air purifier.

First Layer: Large particles such as dust and pollen are captured in the first layer consisting of larger fibers.  In this stage particles are stopped and trapped by direct contact with the filter fibers.  

Second Layer: This layer consists of a finer fibers that collect smaller particles such as bacteria and allergens.  This layer of the filter intercepts the smaller particles that escaped the first layer.

Third Layer: In this layer, much smaller particles like viruses, mold, pet dander and minute particles are filtered out.  This layer consists of ulta-fine fibers, as small as 0.5 micron.  Minute Particles enter this layer with an imparted negative charge and easily adhere stick to the fibers, thus capturing particles as small as 0.1 micron at 99.97% efficiency.