The SR510, P3 R particle filter is a mechanical filter. Mechanical filters function much like a fine-mesh net in which particles become trapped, while clean air passes through very small holes in the filter media.
The SR 510 captures all kinds of particles, such as dust, smoke, fog, spray, spores, bacteria, viruses, and radioactive fallout.
There are 5 filters in a box.
Below you will find a PDF with recommendations for various filter combinations when cleaning the chimney.