Goodman 80% AFUE 40k BTU Two Stage Upflow Furnace GR9T800403AN - Replacement for GM9C800403AN Multi-Position Air Handler Burner: This unit has a

Burner:  This unit has a single stage burner

This is a Goodman 3

In addition to the above features

and less cycling on and off

Goodman 80% AFUE 40k BTU Two Stage Upflow Furnace GR9T800403AN - Replacement for GM9C800403AN Multi-Position Air Handler Burner: This unit has aThis is the Goodman GR9T800403AN, a upflow horizontal, two stage, 80% AFUE, 40k BTU 9 speed furnace. What does that all mean? Keep reading. Orientation: This unit is designed to be used in a upflow or horizontal configuration. These are generally installed in an attic, crawl space, or in a closet on the bottom floor. Efficiency: With an 80% average fuel utilization efficiency (AFUE), 80 cents of every dollar you spend on fuel will be converted into