- Heavy duty Million Air stainless-steel, tubular heat exchanger - Stainless steel secondary heat exchanger - Single stage gas valve - Durable110 volt Silicon Carbide Igniter - Quiet single speed draft inducer - Multi position installation: upflow,convertible horizontal left or right with kit - Cabinet air leakage (QLeak) = 2% - Heavy gauge steel cabinet with durable baked-enamel finish