This air purifier has a three-stage filter system comprised of a H13-rated HEPA filter with a separate mesh layer for dealing with the usual assortment of bacteria, mold spores, pollen, and pet dander, along with an Activated Carbon layer for minimizing odors and gases. It’s worth noting that the BP04 comes bundled with an Activated K-Carbon filter, which is supposed to provide additional protection from nitrogen dioxide compared to the BP03’s standard-fit Activated Carbon filter.

The manufacturer doesn’t issue any maintenance requirements for the filter system. That said, you’ll need to replace the Activated carbon filter every two years, and you can find replacements here. You can also find the pricier K-Carbon filters here. Meanwhile, the H13 HEPA filter has an estimated lifespan of five years. You can find a replacement here.