Gas Furnace Legacy 80% AFUE 90000 BTU SingleStage Multiposition 21-Inch-Wide Cabinet

The Gas Furnace Legacy 80% AFUE 90000 BTU Single-Stage Multi-position 21-Inch-Wide Cabinet (800SB48090M21) provides reliable heating performance with an 80% AFUE rating and a normalized 90,000 BTU input. It features a single-stage gas valve paired with a Multi-18-Speed constant-torque ECM blower motor to deliver efficient and quiet airflow. Designed for installation flexibility, it supports upflow, downflow, or horizontal configurations via its full 4-way multipoise cabinet, which measures approximately 21 wide - 33 1/3 high - 29 deep. Operating on 115 V single-phase power with a ½ NPT gas connection that is field-convertible for natural gas or propane, this unit supports up to nominal ~1,600 CFM airflow and is approved for 13 venting configurations including sealed-combustion or ventilated-combustion-air setups. With its QuieTech noise-reduction system, inner-door sealing for enhanced enclosure tightness, and service-friendly layout, this furnace is engineered for professional HVAC installations demanding dependable performance, straightforward access, and flexible job-site configurations.