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What is Checked on a Gas Safety Certificate? Gas Safety Certificates are required by law. This is important for your tenants' safety and health, and to prolong the life span of your appliances. Your engineer will examine the safety of your gas appliances and pipes. They will then issue the certification. If a device is deemed as Immediately Dangerous (ID) or At Risk (AR), it must be replaced as soon as is possible. Ventilation Your engineer will check the ventilation passage