Why does the collector's suction drop after new cartridges are installed?

Common causes: 1) New cartridge media has dense pores and higher initial resistance — after 1–2 hours of operation, once a thin dust layer forms, suction returns to normal; 2) The pulse cleaning system is not turned on, so dust on new cartridges cannot be removed in time; 3) Blocked ducts or abnormal fan speed. After external faults are ruled out, slightly low initial suction is normal.