Because no welding spiral duct, airtight, watertight, low noise, small ventilation resistance, low cost, strong, beautiful, etc., I am using a high speed fly cutting machines, no edges, no secondary processing, construction safety , diameter and high precision. Use SPIRORIB special reinforced spiral duct, more economical and can save material. Light weight, easy construction. Complete specifications, production speed, fast delivery. Soot, dust purification system This system can be customized to design site-specific conditions, with good cleaning effect, the purification efficiency, for welding fumes, grinding dust, metal cutting fines, dust, sand, dust, etc. have a good cleaning effect, system design air volume from 2000m? / h ----- 200000 m? / h are to meet for a variety of conditions of dust purification requirements to meet the national environmental emission standards