.ST23 (Horizontal three pass wet back) (Output range of 1000 kg/hr to 6000 kg/hr F&A 100°C) .ST25 (Three pass wet back reverse flame) (Output range of 455 kg/hr to 1360 kg/hr F&A 100°C) .ST28 (Horizontal three Pass Wet back) (Output range of 1000 kg/hr to 6000 kg/hr F&A 100°C) .ST32 (Horizontal three pass wet back with Twin furnace)(Output range of 18000 kg/hr to 40000 kg/hr F&A 100°C) .ST36 (Horizontal three Pass Wet back) (Output range of 6000 kg/hr to 24000 kg/hr F&A 100°C) .ST37 (Horizontal three pass wet back) (Output range of 7000 kg/hr to 24000 kg/hr F&A 100°C) .ST65 (Horizontal three pass wet back reverse flame) (Output range of 1500 kg/hr to 5000 kg/hr F&A 100°C)