LE-LS series oven/channel is composed of main body, combustion equipment (heat source can be selected: electricity, natural gas, coal, diesel, diesel, biomass particles, etc.), circulation pipeline, constant temperature control system, etc. When working, heat energy is generated by burning heat source, and hot air is exchanged through circulating pipeline to ensure the uniform heat flow of the whole drying chamber, and then the required temperature is kept stable through constant control system.