How should the airflow of an integrated cooking fume purifier be selected?

Airflow should be estimated from burner count, cooking style, hood area, duct length and simultaneous-use rate; larger is not always better because excessive airflow increases noise, energy use and heat loss. Use the hood and burners for an initial estimate, then have the supplier verify it against the kitchen layout. 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.