1.5 to 5 Tons FEATURES MODEL NUMBER IDENTIFICATION C X 35 - 36 A - 6 F 1 Furnaces with the same letter designation will physically match the indoor coil. Series Unit Type C = Indoor Coil = Upflow Refrigerant Type X = R-410A 1 Cabinet Width A = 14-1/2 in. B = 17-1/2 in. C = 21 in. D = 24-1/2 in. Cabinet F = Cased Metering Device