80% Single-Stg 50K Upflow/Horiz 1-1/2 to 3-1/2 Ton Drive 17.5W Ultra Low Nox
80% 50K Input 2 Stage Variable Speed up/Horiz 3 Ton Drive 17.5W Furnace EcoNet
80% 50K Input 2 Stg Vari Spd Up/Horiz 3 Ton Drive 17.5W Low NOx Furnace EcoNet
80% Single Stage 50K Upflow/Horiz Up To 4 Ton 17.5in W Ultra Low Nox Econet
80% Single-Stage 50K Upflow/Horiz 1-1/2 to 4 Ton Vari Speed 17.5W Ultra LowNox