Why do fumes still escape immediately after the purifier has been cleaned?

Possible causes include wet plates, poor sealing, mismatched airflow, improperly reinstalled cells, leaky ducts or a faulty fan. After cleaning, confirm the cells, access door, seals and power indicators are all normal. Checklist: Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.