The Hepa air purifier is a heavy-duty portable filtration system which can remove some particles in the air, including mold, dander, dust, pollen, drywall, and other debris as small as 0.3 micrometers. The air purifier utilizes one pre-filter and a Hepa filter. The pre-filter can assimilate larger particles and the Hepa filter can assimilate smaller particles to create a cleaner environment. The housing is made of high-quality Ppt materials, which is not easy to break and can be used for a long time. This air purifier can be used in many occasions, such as interior decoration, construction site, flood repair and so on. It's a good choice for you. Don't hesitate to buy it now!