The TempStar SmartComfort™ IIS 90 gas furnace is a new, two-stage, high-efficiency, low-profile 90% model. The furnace can be placed in upflow, downflow, horizontal-left, and horizontal-right configurations. Natural gas models range from 50,000 through 125,000 Btuh, with LP gas conversion kits available. Features include a multispeed PSC blower motor; 24-V hot surface to pilot ignition system; a diagnostic LED indicator located on the gas valve; a nonwelded, stainless steel primary heat exchanger; 40-in. size; and an insulated cabinet. It is backed by a limited lifetime warranty on the heat exchanger and a five-year warranty on all other parts.