(1): ventilation system: the new wind and exhaust, the harmful gases outdoors, the outdoor fresh air to the room, the ventilation system flow is very large, so require the use of less resistance to the air pipeline to save cost and Operating costs - helical ducts produced by spiral ducts are most suitable. Raw materials with galvanized steel, corrosive and particularly humid places can also be produced using stainless steel.

     (2): air conditioning system: central air conditioning, cold storage, etc., with a spiral duct can be posted within the insulation material, beautiful appearance.

     (3): oil and soot system: canteen, restaurants, hotels, kitchen a large number of fumes are produced, need to discharge, the use of spiral duct is the most appropriate, instead of the traditional artificial production, spiral duct strength, economical and practical.

     (4): dust bulk material handling system: flour mill, Zhahua factory, feed mill, dust collector collection and transportation, pneumatic conveying system, some of the more loose material particles can be used spiral duct delivery, low cost , The effect is good.

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