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

The Gas Furnace Comfort 80% AFUE 90000 BTU Single-Stage Multi-position (58SB0B090M21--16) brings 90,000 BTU input (standard nomenclature 090 = 90,000 BTU) with 80% efficiency in a flexible 4-way multipoise cabinet engineered for up-flow, down-flow or horizontal installations. Its 21 wide cabinet offers ample service space in large-footprint mechanical rooms, while the Multi-18-Speed Constant Torque (MCT) ECM blower motor ensures precise airflow control and quiet operation. Designed for 115 V single-phase electrical supply with a unit ampacity around 11 A (maximum fuse or circuit breaker 15 A), it comes factory configured for natural gas with a ½ NPT gas connection and is convertible to propane with the accessory kit. The unit is certified for a temperature rise range of 40-70 °F and a heating external static pressure rating of 0.15 in w.c., it features an aluminized-steel primary heat exchanger and supports up to 13 venting configurations for maximum installation flexibility.