two-stage gas furnace heat gas: up-stage gas gets into electrical detarrer. whose work temperature is between 90-150℃.where the light tar fog-drops and dusts are polarized and then influxed on inside wall of polar tube. Andfinally flows automatically to light oil jar. the content of ligth tar is equal to heavy diesel oil . firstly.down-stage gas gets throgh ash-dropping tube to separate large size dust.then.gas into the cyclone separation is centrifugally separated and gas temperayure is lowerd to about 450-550℃.up-stage gas is mixed with down-sage gas for heating stove through gas pipes. 
Tow-stage gas funace Chart
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Product Readme
