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What is Checked on a Gas Safety Certificate? A Gas Safety Certificate is a legal requirement for landlords. This is important for your tenants' security and health, and also to extend the life of your appliances. Your engineer will inspect the gas appliances and pipes to confirm that they are safe for use. They will then issue the certification. If a device is deemed as being Immediately Dangerous (ID) or At Risk (AR) the appliance must be replaced as soon as is possible. Ventilation Your engineer will check the ventilation passages of each ap