What is a requirement for the termination of venting systems for gas appliances?

The requirement for the termination of venting systems for gas appliances emphasizes that they must be free from obstruction and adequately spaced from structures. This is crucial for ensuring that the exhaust gases from the appliance can safely disperse into the atmosphere without being hindered by nearby buildings, vegetation, or other objects. Proper spacing helps prevent the accumulation of harmful gases, which could pose a safety risk to occupants and the environment.

Obstructions can lead to backdrafting, where combustion gases are drawn back into the appliance or living spaces instead of venting outside, potentially causing exposure to carbon monoxide and other hazardous substances. Therefore, adhering to this requirement ensures the safe and efficient operation of gas appliances and protects health and safety standards as outlined in the National Fuel Gas Code.