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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 check, the engineer will inspect the flue and if necessary take it apart. He will also test every appliance for carbon monoxide. The engineer will remove the appliance if it is classified as "Immediately Dangerous". It is necessary to fix this issue before it is al