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(1.25 kPa) 12” W.C. (3.00 kPa) Manifold Pressure - High 3.8” W.C. (0.95 kPa) 11” W.C. (2.74 kPa) Manifold Pressure - Low 1.1” W.C. (0.27 kPa) 3.3” W.C. (0.82 kPa) Orifi ce Size #44 DMS - 0-2000ft #45 DMS - 2000-4500ft #54 DMS Minimum Input Altitude 0-2000 ft. (0-610m) 12,500 BTU/h (3.66 kW) 10,500 BTU/h (3.07 kW)Minimum Input Altitude 2000-4500 ft. (610-1372m) 10,500 BTU/h (3.07 kW) Maximum Input Altitude 0-2000 ft. (0-610m) 22,500 BTU/h (6.59 kW) 21,500 BTU/h (6.30 kW)Maximum Input Altitude 200