ARMSTRONG AIR® Flagship Constant Torque Gas Furnace, Model: A951E, Input BTU Rating: 70000 Btu/hr, Output BTU Rating: 42000 Btu/hr, 120 VAC, 6.8 A, 155 to 1770 cfm, 95 % AFUE Rating, 1 ph Phase, 60 Hz, 2 Stages, Down Flow, 1/2 in Connection, 16 in H x 17-1/2 in W x 16-3/8 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, 25 to 65 deg F Temperature Rise