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Why It Is Important To Have An Annual Gas Safety Check The law requires landlords to have gas appliances and flues inspected by an Gas Safe engineer annually. This includes shared appliances, such as boilers. During the check the engineer will look at the flue and if necessary remove it. He will also check for carbon monoxide levels in each appliance. If an appliance is deemed "Immediately Dangerous", the engineer will disconnect it. You'll need to fix this issue before it is all