Qingzhou Yongsheng Machinery Co.,Ltd is one of the professional China automatic coal fired air heater manufacturers and suppliers,Website:://.qzys-exhaustfan.com, welcome to wholesale low price coal burning air heater from our factory.FEATURESAdopt innovative negative-pressure and oxygen-rich combustion technology. Avoid uneven temperature, inadequate burn, overmuch smoke, partial burning loss, and other problems, brought by positive-pressure combustion.National patented fire pipe resist temperature as high as 1500℃, with 10 years service life. Avoid burning through, crack, short service life, and other problems.Unique entire thermal insulation design, decrease thermal loss lowest and keep combustion efficiency as high as 95%.Adopt double combustors to increase coal use ratio. Inadequate burning coal in the first combustor can fall into the second combustor to burn second time. All kind of coal can be burned sufficiently.Remove dust automatically, time saving and labor saving.Intelligent control. Force draft fan and air blower can open or close automatically. Control the air input, hot air output and environment temperature automatically. Safe and convenient.Automatic alarm protect the device automatically.Smoke and air move in their own ways, no pollution and up to national lever