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Why It Is Important To Have An Annual Gas Safety Check Gas Safe engineers must inspect the flues and gas appliances annually. This includes appliances that are shared, like boilers. During the inspection the engineer will look at the flue. If needed the flue is damaged, he will take it apart. He will also test for carbon monoxide levels in each appliance. The engineer will shut off the appliance if considered to be "Immediately Dangerous". You'll need to resolve this before it can be again used. Gas Safety Certificates Gas is a well-known energy source in the UK as