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– For rooms with a volume greater than 10m3 - no permanent ventilation is required. Note: Regardless of room size, all rooms containing the appliance must have direct access to the outside air via an openable window or equivalent. – Where there are other fuel burning appliances in the same room, BS 5440-2: 2000 should be consulted to determine the correct amount of free area ventilation requirements. – The above requirements allow also for use of a gas oven and grill but if there are other gas b