The Goodman GME81005CX is a multi-speed gas furnace. It uses a dual-diameter tubular heat exchanger. It is housed in a fully-insulated heavy-gauge steel cabinet with a durable baked-enamel finish. A multi-speed energy-efficient circulator (ECM) motor operates gently to adjust to temperature demands. This Goodman gas furnace is a two-stage, multi-speed, multi-position heater. It uses a durable 115V Silicon Nitride igniter to maintain a comfortable temperature in the home. This Goodman gas furnace has a heating capacity of 100,000 BTU.