The installation of 2 sets of high clean direct coal-fired hot air furnaces with large heat supply have been fully installed abroad. The hot air furnace has applied for a number of national patents and has been supported by the science and technology fund of the Ministry of Science and Technology of the People's Republic of China. It is widely used for drying or calcining daily chemical, ceramics, fertilizer, chemical, корм, гума, будівельні матеріали та інші продукти .
