Gas Furnace Legacy 80% AFUE 90000 BTU Single-Stage Multi-position 17.5-Inch-Wide Cabinet

The Gas Furnace Legacy 80% AFUE 90000 BTU Single-Stage Multi-position 17.5-Inch-Wide Cabinet (800SB42090M17) delivers reliable heating performance with an 80% AFUE rating and a normalized 90,000 BTU input. It incorporates a single-stage gas valve and a Multi-18-Speed constant-torque ECM blower motor, supporting upflow, downflow or horizontal installation in a full 4-way multipoise cabinet measuring approximately 17.5-inch-wide 33…“ high 29 deep. The unit operates on 115 V single-phase power, is field-convertible for natural gas or propane via a ½ NPT gas connection, and supports up to nominal 1,400“1,600 CFM airflow in heating mode. Certified for a temperature rise range of 30“60 °F and compatible with 13 approved venting configurations”including sealed-combustion or ventilated-combustion-air setups”this furnace is engineered for technician-friendly installation, quiet operation (via QuieTech noise-reduction technology) and service access tailored for professional HVAC applications.