Gas Furnace Infinity 80% AFUE 110000 BTU Two-Stage Multi-position 21-Inch-Wide Cabinet

The Gas Furnace Infinity 80% AFUE 110000 BTU Two-Stage Multi-position (58TN0B110C21--20) delivers a 110,000 BTU input (nominal) at 80% efficiency, designed for up-flow, down-flow, or horizontal installation. The 21-wide cabinet provides robust service access in larger mechanical spaces while the 4-way multipoise design enables up to 13 venting configurations. Featuring a two-stage gas valve and a variable-speed, constant-airflow ECM blower motor, this unit ensures smooth transitions between stages, quiet operation, enhanced humidity control, and precise airflow tuning. It operates on 115 V single-phase power, with a typical unit ampacity around 14 A and a recommended breaker size of 20 A, and uses a ½ NPT gas connection factory-set for natural gas and convertible to propane. With an aluminized-steel primary heat exchanger, certified temperature-rise range of 40-70 °F, and compact height of approximately 33 1/3, this furnace is engineered for reliable performance, technician-friendly installation, and long-term serviceability.