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Why It Is Important To Have An Annual Gas Safety Check The law obliges landlords to have gas appliances and flues checked by a Gas Safe engineer annually. This includes shared appliances, such as boilers. During the inspection the engineer will look at the flue, and if necessary remove it. He'll also test each appliance for carbon monoxide. If a device is deemed 'Immediately Dangerous', the engineer will disconnect it. You'll need to fix this issue before it can be used again. Gas Saf