Gas Furnace Comfort 96% AFUE 40000 BTU Single-Stage Multi-position 17.5-Inch-Wide Cabinet

The Gas Furnace Comfort 96% AFUE 40,000 BTU Single-Stage Multi-Position (59SC6A040M17--12) delivers a 40,000 BTU input with approximately 38,000 BTU output at 96% efficiency, built for flexible upflow, downflow, or horizontal installation in a 4-way multipoise cabinet. Its 17.5-wide cabinet (35 high- 29 1/2" deep) fits tight mechanical spaces while preserving full front service access. A single-stage gas valve and multi 18-speed constant-torque ECM blower motor provide quiet, efficient airflow and dependable comfort. The unit operates on 115 V single-phase power with typical running current near 6 A on a 15 A circuit, and uses a 1/2" NPT gas connection factory-set for natural gas with field conversion available for propane. With direct-vent or single-pipe venting options, a temperature rise range of 35“65 °F, and durable aluminized-steel primary plus stainless-steel secondary heat exchangers, this Comfort Series furnace is engineered for technician-friendly installation, reliable performance, and long service life.