WeatherKing® Standard-Grade Gas Furnace, W921T Model, 42000 Btu/hr Input BTU Rating, 39900 Btu/hr Output BTU Rating, 115 V Voltage Rating, 8 A Amperage Rating, 1/2 hp Rating, 92 % AFUE Rating, 373 W Wattage, 1 ph Phase, 60 Hz Frequency Rating, 1 Number of Stages, 4-Way, Multi-Position Configuration, Connection Type: NPT, 1/2 in Connection, 5 Number of Speeds, 11 in Dia x 7 in W Blower Size, 34 in H x 17-1/2 in W x 29-5/8 in D Cabinet Dimensions, ECM Motor Type, 3 ton Tonnage, Electronic Ignition System, Direct Spark Ignition Type, 0.224 kPa, Stainless Steel/Steel, 25 to 55 deg F Temperature Rise, Domestic Domestic/Import