Self_circle aspirators in series Model TFXH are used to clean granule materials in flourmills，feed mills，medicine，oil mills，food and brew field. there can be separatedlow density materials from graule materials such as wheat，barley，corn，oil seed，maize. it adopt self—circle enclose unit and has the function of removing dust, not only has saved other cleaner but also carry on air exchange with the external world. it offers advantages such as low energy consumption and no pollution.