How should oven tray specifications be confirmed?

Please verify the following points and require itemized written supplier responses:（commercial oven oven-trays） Confirm length, width, depth, material, GN or bakery standard, layer spacing and spare quantity. Deformed trays affect loading and airflow, so match trays with the oven before ordering. 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.