Final answer:
The Department of Energy (DOE) is responsible for setting gas fired equipment standards, while the Environmental Protection Agency (EPA) oversees environmental protection, which may influence these standards.
Step-by-step explanation:
The government agency involved in setting gas fired equipment standards is the Department of Energy (DOE). The DOE oversees national energy policy and its mandate includes the supervision of energy production and consumption, including standards related to equipment efficiency and safety. On the other hand, the Environmental Protection Agency (EPA) is responsible for protecting human health and the environment. Guidelines and regulations set by the EPA may affect how gas-fired equipment operates in order to meet air quality standards, but actual equipment standards would typically fall under the purview of the DOE.