The American Standard S9X1C100U5PSBA is a single-stage gas furnace that exemplifies energy-efficient and reliable heating. Boasting an up to 96% AFUE rating, this model utilizes most of the fuel it uses for direct heat to your home, minimizing waste and saving on energy costs. Equipped with an ECM motor, this furnace supports upflow configurations, providing versatility in installation. Housed in a durable, insulated steel cabinet, it ensures quiet operation and retains more heat for efficient home warming. With a 100,000 BTU capacity, it's ideal for medium to large-sized homes.