The Goodman GMS9 is a discontinued single-stage, multi-speed gas furnace with an efficiency of 93% AFUE. It had an aluminized steel tubular primary heat exchanger and a stainless steel secondary heat exchanger. Quiet operation was provided by a corrosion-resistant, sound-isolated induced draft blower assembly and fully insulated heavy gauge steel cabinet. The GMS9 was designed for multi-position installation, including upflow and horizontal right or left positions. Other features included aluminized steel inshot burners, multiple flame roll-out switches and a blower door safety switch. Gas and electric connections were located on both right and left sides of the unit.
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