A dust filter is a device used to filter particles and pollutants in the air. It usually consists of one or more layers of filter material that can capture and block tiny particulate matter such as dust, pollen, viruses, mold, smoke, odors, etc. in the air, thereby providing cleaner, healthier indoor air. The working principle of the dust removal filter element is to capture particulate matter in the air through physical filtration, electronic electrostatic adsorption, chemical adsorption, etc.