What is the purpose of a pressure gauge on a cooking fume purifier?

A pressure gauge indicates filter or cell blockage, and a sustained rise usually signals cleaning or maintenance, helping prevent reduced fan performance. Without a gauge, establish fixed inspection and cleaning intervals. 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.