When should activated carbon in an integrated unit be replaced?

Carbon life depends on airflow, odor concentration, operating time and carbon depth; replace it when odors return, pressure difference changes or the service interval is reached. Activated carbon cannot be washed and reused effectively; odor removal drops sharply once it is saturated. 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.