Is fume compliance achieved if no white smoke is visible?

No. Absence of visible smoke only shows that some particles are not obvious; GB 18483 still requires emission concentration and removal efficiency, and local standards may also address odors and other pollutants. Compliance should be determined by qualified testing and monitoring data. 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.