What happens if a cooking fume purifier is not cleaned for a long time?

Grease buildup lowers efficiency, increases resistance and fan load, and may cause arcing, odors, breaker trips or even fire risk. If performance drops, noise rises or protection activates frequently, inspect the contamination level first. 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.