Which type of CNG installation is not a single-family dwelling?

The correct choice identifies a commercial installation as one that is not classified as a single-family dwelling. Commercial installations are typically designed for business purposes, serving entities such as offices, retail spaces, or industrial operations. Unlike residential units, private domiciles, and farm facilities, which are primarily focused on individual living situations or personal use, commercial installations cater to a broader range of users and operational needs.

Residential units and private domiciles refer to spaces where individuals or families live, while farm facilities may include structures used for agricultural operations. These classifications are all associated with housing or personal living situations, in contrast to commercial installations, which involve the business sector's requirements for CNG fueling or service.

Understanding the distinction between these types of installations is essential for anyone working in the field of compressed natural gas delivery, as it impacts regulations, safety standards, and operational protocols associated with each type.