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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 examined by a Gas Safe engineer annually. This includes appliances that are shared, like boilers. During the inspection, the engineer will examine the flue and if necessary remove it. The engineer will also test for carbon monoxide levels in each appliance. The engineer will disconnect the appliance if it's classified as "Immediately Dangerous". This issue must be addressed before the appliance can be re-used. Ga