The industrial commercial HEPA air purifier is a heavy-duty portable filtration system that can remove some particles in the air, including mold, dander, dust, pollen, drywall, and other debris as small as 0.3 micrometers. The heavy-duty air scrubber is designed with 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. What's more, the housing is made of premium PPT materials, which is not easy to break and can be used for a long time. Hence, this air purifier can be used on many occasions, such as interior decoration, construction sites, flood repair, and so on. Please note: This product does not meet California air cleaner regulation requirements, and cannot be shipped to California.