What should be confirmed for a custom commercial oven?

Please verify the following points and require itemized written supplier responses:（commercial oven oven-custom） Confirm dimensions, layers, tray size, temperature range, energy type, voltage, logo, packaging and acceptance criteria. Seal samples before mass production and clarify temperature tolerance, appearance and lead time. 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.