How does a leaking oven door seal affect operation?

Please verify the following points and require itemized written supplier responses:（commercial oven oven-seal） Aged seals or deformed doors lose heat, slow preheating, increase energy use and cause uneven results near the door. Inspect seal resilience, hinges and door gaps, and replace matching parts when damaged. 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.