Rheem® Line Standard Gas Furnace, R951T Series, Classic® Model, 42000 Btu/hr Input BTU Rating, 39900 Btu/hr Output BTU Rating, 115 V Voltage Rating, 10 A Amperage Rating, 990 cfm Rating, 1/2 hp HP Rating, 95 % AFUE Rating, 1 ph Phase, 60 Hz Frequency Rating, 1 Number of Stages, 4-Way Multi-Position Configuration, Connection Type: NPT, 1/2 in Connection, 7 mm W x 11 mm D Blower Size, 34 in H x 17-1/2 in W Cabinet Dimensions, CTEC Motor Type, 15 A Fuse Rating, 3 ton Tonnage, PlusOne® Ignition System, Direct Spark Ignition Type, 1 kPa, 20 to 50 deg F Temperature Rise