Description: Energy-saving and environment protection: to reduce coal consumption more than 45% than air-heating. High-efficency: to improve the heating area 40% to keep a stable temperature condition with the triple explosion-proof under normal pressure to ensure safety. Specification: 50,000/100,000/400,000 kcal/hr Heating area: 300/600/1200/1800 square meter Adopt Micro and Nano coating technology to reduce energy consumption by 8% to 10% Amazing dedusting function and green environment design Combustion chamber equipped with 50 chrome alloy designed to three-pass boiler can bear fire-resistant temperature as high as 1700°C for over 10 ten years’ life sevice. Anti –corrosion and no dedusting.Auto-alarm function and automatic protection function. Pressure fan and blower can realise automatic control of the switch or manually. Automatic control of the air-input ,warm air-output and ambient temperature. Alternative temperature control system: computer-control system and digital-control system. Unique thermal insulation design to keep the lowest rate of heat loss. Special conbustion chamber design is suitable for all tpyes of coal. The air-heater, which applys the latest indirect heating technology , combines the function of combustion and heat exchange which was conducted by the high-temperature part of furnace body. Fast and high heat efficiency (80%-95%),small size and easy installation, low price( half of the price of the heating system of 1 ton boiler)