ARMSTRONG AIR® Flagship Constant Torque Gas Furnace, Model: A951E, Input BTU Rating: 90000 Btu/hr, Output BTU Rating: 55000 Btu/hr, 120 VAC, 8.4 A, 210 to 1740 cfm, 95 % AFUE Rating, 1 ph Phase, 60 Hz, 2 Stages, Horizontal/Up Flow, 1/2 in Connection, 19-1/2 in H x 21 in W x 19-7/8 in D Cabinet, High Efficiency Blower Motor, Vent, Ducted or Ductless: Vent, 15 A Fuse Rating, Tonnage: 4 ton, 40 VA Transformer, Integrated Smooth Ignition, Stainless Steel, Finish: Aluminum, 30 to 70 deg F Temperature Rise