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58CTA Performance™ 80 2-Stage Gas-Fired Furnaces Up to 80% AFUE Performance and Sizing Information Size Rated Heating Input (Btuh)* Upflow/Downflow-Horizontal Rated Heating Output (Btuh)* Upflow/Downflow-Horizontal AFUE* % Selectable Cooling CFM @ 0.5 ESP Max./Min.† Vent Dia (in.) Casing Width (in.) Approx Ship Weight (lbs) High Stage Low Stage High Stage Low Stage 045–1-08 44,000 29,000 35,000 23,000 80.0 845/555 4 14 3/16 116 045–1-12 44,000 29,000 36,000 23,000 80.0 1175/745 4 14 3/16 119 070–1-08 66,000 43,500 54,000 36,000 80.0 900/550 4 14 3/16 120 070–1-12 66,000 43,500 54,000 36,000 80.0 1240/670 4 14 3/16 124 070–1-16 66,000 43,500 tba tba 80.0 tba 4 17 1/2 138 090–1-14 88,000 58,000 71,000 47,000 80.0 1385/1065 4 17 1/2 136 090–1-16 88,000 58,000 71,000 47,000 80.0 1720/940 4 21 151 090–1-20 88,000 58,000 tba tba 80.0 tba 4 21 156 110–1-12 110,000 72,500 89,000 59,000 80.0 1355/1065 4 17 1/2 144 110–1-16 110,000 72,500 89,000 59,000 80.0 1695/935 4 21 158 110–1-22 110,000 72,500 89,000 59,000 80.0 2220/1200 4 21 163 135–1-16 132,000 87,000 107,000 70,000 80.0 1710/1210 5‡ 21 163 135–1-22 132,000 87,000 107,000 70,000 80.0 2110/1530 5‡ 24 1/2 174 155–1-20 154,000 101,500 124,000 82,000 80.0 2230/1495 5‡ 24 1/2 181 * Capacity and ratings in accordance with U.S. Government DOE test procedures with isolated combustion system. De-rate heating input in high fire (only ) for downflow and horizontal applications by 1,000 Btuh per burner. † Listed CFM is for single-speed cooling. ‡ 4-inch vent connection in all funaces.

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