HEPA air filters are commonly used in air purifiers, HVAC systems, and vacuum cleaners to improve air quality by trapping dust, allergens, mold spores, pet dander, smoke particles, and some bacteria.

Honeycomb activated carbon filter uses paper honeycomb, plastic honeycomb, aluminum honeycomb with through-hole structure as carrier,and fils fruit shell charcoal or coconut shell charcoal in the through-hole.It is a common way to use activated carbon in air filter.