The Goodman GMH80805CN is part of the brand's GMH8 line. These gas furnaces are designed for use with single stage room thermostats and offer a protective baked enamel finish and insulated steel cabinet that allow it to be placed in many locations throughout the home. The 80 efficiency rating of this model refers to the fact that, at peak conditions, 80 cents of every dollar spent running this unit will go into heating the home. With a cabinet width of 21", this Goodman gas furnace has 80,000 BTU and a maximum CFM at 0.5" ESP of 2,000.