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Why It Is Important To Have An Annual Gas Safety Check The law requires landlords to have their gas appliances and flues checked by a Gas Safe engineer annually. This includes shared appliances, such as boilers. During the inspection, the engineer will examine the flue. If needed, he may disassemble it. The engineer will also test for carbon monoxide levels in each appliance. If a device is deemed 'Immediately Dangerous', the engineer will disconnect it. It is necessary to fix this before it is allowed to be again used.