Gas Furnace Preferred 80% AFUE 90000 BTU Two-Stage Variable-Speed Multi-position 21-Inch-Wide Cabinet

The Gas Furnace Preferred 80% AFUE 90,000 BTU Two-Stage Variable-Speed Multi-Position (820TB60090V21) delivers consistent, quiet comfort with an 80% AFUE efficiency rating and a normalized 90,000 BTU input. Designed for professional installation, it features a two-stage gas valve and a variable-speed ECM blower motor that optimizes airflow and system performance while maintaining smooth, quiet operation. The 21-wide cabinet (approximately 33 1/2" high - 29 deep) supports upflow, downflow, or horizontal installation in a full 4-way multipoise configuration for maximum versatility. Operating on 115 V single-phase power, this furnace includes a 1/2" NPT gas connection that is field-convertible for natural gas or propane and supports up to 1,800 CFM nominal airflow. Certified for a temperature rise range of 30-60 °F and a maximum external static pressure of 0.12 in. w.c., the unit accommodates 13 approved venting configurations for sealed or ventilated combustion air. Featuring Perfect Heat adaptive control, Fan On Plus continuous fan capability, QuietGuard sound insulation, and technician-friendly service access, the 820TB60090V21 combines performance, flexibility, and durability for professional-grade HVAC installations.