For residential CNG fueling appliances installed indoors, what is the maximum capacity in standard cubic feet per minute?

The correct answer is based on safety regulations and manufacturer guidelines regarding the installation of residential CNG (Compressed Natural Gas) fueling appliances indoors. The capacity of 5 standard cubic feet per minute is established to ensure proper ventilation and minimize the risk of gas accumulation, which could pose safety hazards, such as explosive atmospheres or leaks.

When determining the maximum allowable capacity for these appliances, it is crucial to consider factors such as the potential for gas buildup in enclosed spaces and the need for adequate air exchange. If the capacity were higher, the risk level would increase significantly, potentially leading to dangerous situations in a residential environment.

Thus, the limit of 5 standard cubic feet per minute helps to maintain a balance between providing sufficient fueling capability and ensuring that safety is prioritized for indoor applications.