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What is Checked on a Gas Safety Certificate? Gas Safety Certificates are legally required. This is essential for your tenants' safety and health, as well as to prolong the life span of your appliances. Your engineer will check the safety of your gas appliances and pipes. They will then issue the certification. If an appliance is deemed as being Immediately Dangerous (ID) or At Risk (AR) and is at risk, it should be replaced as soon as possible. Ventilation As part of a gas safety inspection the engineer will examine the ventilation passages of every