Basic model of a federally regulated walk-in cooler or walk-in freezer that is commercial or industrial equipment

means all components of a given type of walk-in cooler or walk-in freezer (or class thereof) manufactured by one manufacturer, having the same primary energy source, and which have essentially identical electrical, physical, and functional (or hydraulic) characteristics that affect energy consumption, energy efficiency, water consumption, or water efficiency; and with respect to panels, which do not have any differing features or characteristics that affect U-factor.