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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 an Gas Safe engineer annually. This includes shared appliances such as boilers. During the inspection the engineer will look at the flue. If necessary the flue is damaged, he will take it apart. The engineer will also test for carbon monoxide in each appliance. If an appliance is deemed 'Immediately Dangerous', the engi