Spiral duct: Spiral duct is a thin-walled pipe that is rolled into a spiral seam by a metal strip. It is round. Its main features are: no welding, no air leakage, no water leakage. It is mainly used for air supply and bulk material transportation, rather than the traditional white iron pipe (ie hand-sewn iron pipe). It is an air duct that does not need to be tapped by hand. (1) Air supply, including ventilation, such as supply and exhaust of fresh air, covering a wide range, such as factory workshops and production sites. Due to the generation of harmful gases, it is necessary to discharge the outdoor air into the room and transport the outdoor air to the room. (2) Cooling. The most common is the central air-conditioning duct, which requires insulation material. (3) Exhaust smoke. Hotels, restaurants and hotel kitchens have a lot of oil fumes that need to be discharged. The circular air duct used is a hood. (4) Dust removal. In some factories, there is a lot of dust in the workshop and special dust removal equipment is required. Spiral duct is suitable for pipes with large air volume. (5) Bulk material transportation. In the production process of some factories, it is necessary to transport loose particles, especially those with smaller proportions, such as foamed plastic particles. The spiral air duct is used, which has low cost and good effect. Ventilation duct: 1. Unique design: Install smoke check valve and fire isolation door on the opening of ventilation duct to effectively prevent cross odor and cross fire. 2. Low cost: Compared with traditional brick ventilation ducts, ventilation ducts can save about 40% of the engineering cost. 3. Flexible design: Ventilation duct processing can adjust the size of the duct at any time according to the size of the reserved hole. 4. High quality and high strength: Compared with the traditional brick air duct, the magnesite air duct is light in weight and high in strength, which can greatly reduce the bearing capacity of the building
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