"Dust emission" means that dust has penetrated the filtration system, with the main causes as follows:

Filter cartridge/bag damage: This may be caused by airflow scouring, abrasion or corrosion.

Poor installation sealing: The sealing ring between the filter bag opening and the tube sheet is aged or not compressed tightly, resulting in an air bypass.

No pre-coating before initial use: New filter media have relatively large pores, and a dust layer needs to be formed first to achieve the optimal filtration state.