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Why It Is Important To Have An Annual Gas Safety Check Gas Safe engineers must inspect gas appliances and flues every year. This includes shared appliances like boilers. During the inspection the engineer will look at the flue. If needed, he may disassemble it. He will also check for carbon monoxide in every appliance. If an appliance is declared 'Immediately Dangerous' the engineer will remove it. You'll need to fix this before it can be again used