Replacement Filters for the AllerAir 4000 series Air Purifiers (which are sold separately.) 4 pcs. The Pre filter 4000 4 pk. Series are not your ordinary filters. They are carefully designed to remove large dust particles from the environment. A large majority of people suffer from respiratory conditions, which can be greatly reduced by eliminating allergens, and toxins from their living spaces. Dusting removes most of the particles, and other particles are left behind. With a powerful pre filter, left over particles are soon picked up and trapped inside the pre filter 4000. Most filters catch small dust particles, without any problems, leaving the surfaces particularly spotless.
However, when it comes to removing large dust particles, most filters are not equipped or powerful enough. For the best cleaning performance the pre filter 4000 should be replaced every 3 to 4 months. While most filters allow large particles to clog its pores, the pre filter 4000 does not. Large particles such as lint and dust are easily picked up and trapped inside the filter. Another added bonus of the Pre filter 4000 is the tar trapping pre filter, which captures tar from cigarettes.