York LX Series TM8Y and ENERGY STAR®-rated TM9Y respectively deliver efficiencies up to 80% and 96% AFUE. Factory-shipped for upflow or horizontal applications, furnaces can be converted for downflow applications. Accessible controls and lack of knockouts aid installation, and 33 in. cabinets fit in space-restricted areas. Other features include self-diagnostics with fault code display; electric hot surface ignition; 100% shut-off main gas valve; and aluminized steel tubular heat exchanger.