There is no need to divide the operation room and the dining room into separate fire zones. If it is a multi-storey building, the area of each fire zone should be controlled within 2,511 square meters without spraying, and the kitchen operation room should be separated from other rooms by Class B fire doors. The standard provisions of the building regulations are: 7.2.3 Article 5. Please refer to the building regulations: 5.3.5, for details.