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Gas Safety - Why Landlords Need to Inspect Their Gas Appliances Landlords are required to have their gas appliances tested for safety by law. This helps prevent carbon monoxide poisoning, which can be fatal. A CP12 gas safety certificate contains crucial information, such as the date of the inspection as well as the name of the engineer and registration number. It also includes a list of the gas appliances and flues that were inspected. Legal Requirement Gas appliances and flues