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1. Elaboration
Fabric air duct system is a flexible air distribution system made of special fibers, which is a kind of air supply terminal system replacing traditional air supply ducts, air valves, diffusers, thermal insulation materials, etc. It is an air supply terminal system that can supply air evenly in a linear manner, mainly depending on the unique air outlet mode of fiber penetration and orifice jet. Bag air duct system consists of bag air duct and its components (straight pipe, inlet, end, tee, elbow, reducer, etc.), components (PAD type air valve, ACD type air valve, filter, static pressure box, etc.) and accessories (steel rope, lifting ring, basket bolt, collar, clip, rubber sleeve, etc.).
2. Advantages of fabric duct application
The fabric air duct has many advantages over the traditional metal type air duct in terms of material composition, processing and installation
2.1 The air supply of the fabric duct is more uniform and comfortable than that of the traditional air duct. The flexible air distribution system of the fabric duct is made of special fibers. The fabric duct mainly relies on the unique air outlet mode of fiber penetration and orifice jet, and the air is discharged through the fiber gap of the whole pipe wall or the uniformly distributed designed multi row small holes, that is, the air is supplied in a linear manner along the longitudinal direction of the pipe, and the air is supplied in a fan direction in the axial direction, forming a three-dimensional air supply together; Traditional air ducts rely on point air supply, with small air supply area, large and uneven wind speed. In comparison, the fabric duct is more uniform and comfortable.
2.2 Fabric air duct coordination beautiful fabric air duct is processed and customized by the manufacturer. According to the needs of indoor environment coordination, a variety of colors can be selected for personalized design, and the length range and layout structure have a variety of choices to adapt to the application of various new structures. The installation of traditional air duct is hoisted by multiple supports, and the pipe joints are connected by flanges, which causes the traditional air duct system to be messy and cumbersome, and its appearance looks old due to fading over time.
2.3 The fabric fabric air duct system for energy conservation and noise reduction in use is soft, the wind speed is low during operation, and resonance will not be generated and transmitted, reducing the noise in use; In addition, it uses synthetic fiber, which is stable in material and convenient for folding and installation, and can be reused. At the same time, it uses large space laminar air supply mode, making the system more energy-saving. The traditional air supply system, especially the metal material system, does not absorb sound, and the air duct and equipment will have resonance during operation, which generally causes large noise.
2.4 Cost economy In terms of materials, compared with steel plate, fabric duct is a more economical alternative to traditional metal duct. The fiber will not rot or rust due to the length of service time, and the material will not be lost during factory processing. The material cost, installation and maintenance costs are cheaper. When the air duct absorbs too much dust and the surface is stained, the bag air duct is very convenient for disassembly and assembly, and can be easily cleaned to improve the air cleaning quality in the system. Most of the traditional metals are made on site, which takes a long time compared with the processing of manufacturers. Due to heavy metal materials and complex installation procedures, the installation takes a long time, requires more labor, and costs relatively high.  
2.5 The short construction period cloth bag air duct is made of special fibers, which is extremely light, about 1/40 of the traditional metal air system, and it uses a special supporting steel rope or slide rail suspension system, which is simple and fast. The installation time is often 1/10 of the traditional system or less, greatly shortening the project cycle. From the above comparative analysis, the fabric air duct system has certain advantages over the traditional metal air duct system in terms of installation, viewing, use comfort, cost economy and construction speed. With the continuous innovation of fiber material technology and textile technology in the world, more and more fibers with special performance are made into air distribution systems, which expands the application field of fiber fabric air distribution systems, At present, it has become a ventilation system model that occupies a considerable share in the market, and its future application prospects and fields will be more extensive.
3. Application field of fabric air duct
Fabric air duct has more obvious advantages than traditional metal air duct, and its application prospect will be more extensive. At present, the fabric air duct has been applied in various fields, involving the public, commercial and industrial fields, especially in places with strict requirements on the uniformity of air temperature and air quality. For example, the public domain is used in large space public places such as exhibition venues, conference centers, transportation hubs, and offices. Such areas generally have high space, most of which are grid structures that cannot bear loads, and large air conditioning areas, which require a long air supply range, but have certain requirements for wind speed; In the commercial field, it is used in supermarkets, shopping malls, restaurants, entertainment and other large space commercial places. Such areas generally have large air conditioning area, small space and large air supply volume, requiring uniform and comfortable air supply without dead space, and also have certain requirements for aesthetics; In the industrial field, it is used in large space industrial plants such as food, electronic machinery, chemical medicine, printing and weaving, warehousing, tobacco, etc. Some of these areas have suspended ceilings and some do not have suspended ceilings. The space is high, the air supply is large, and the installation is complex, requiring uniform air supply. The selection of bag type air supply is mainly based on several aspects: (1) product quality has high requirements for temperature uniformity and cleanliness; For example, in some frozen food processing workshops, because there is oxygen in the air of traditional food factories, which is also relatively humid, bacteria are more likely to breed in the environment with oxygen and water. Therefore, large refrigeration capacity, low wind speed and cleanliness are required in such places. (2) The air supply has adverse effects on the production workers: the traditional point type air supply of air duct is often easy to cause the lower workers to feel uncomfortable under the influence of wind, causing various human health problems. The bag air supply system adopts a unique air supply mode of fiber penetration and orifice jet. The air supply area is large, the wind speed is lower than that of the traditional air duct, and the air supply is uniform, which makes indoor workers have good comfort and avoids many problems. (3) There are high requirements for indoor environmental coordination: in some public and commercial fields, there are high requirements for the coordination and aesthetics of the overall environment. Bag air duct can meet the needs of environmental coordination through personalized design and production as required. (4) Economical installation cost, short construction period and simple maintenance are very important conditions: low project investment cost, short installation period, simple disassembly, low maintenance cost and other characteristics are important aspects for selection and application in this field. 4. The construction and installation of the bag air duct The construction and installation of the fabric air duct are combined with the example of the application of the fabric air duct in the Benz PDI reconstruction project of the second phase standard warehouse and factory building in the logistics processing zone of Tianjin Dongjiang Free Trade Port Area. The analysis of the whole process requires the drawing of the construction drawings, the production and processing of the manufacturer's main materials, the preparation of relevant components and the on-site installation process.   
4.1 Preparation of construction drawings Before processing the fabric duct, it is necessary to draw a detailed construction drawing according to the design drawings of the duct system, and then count the number of Sauss duct systems and the length of each system according to the construction drawings, and calculate the accessories required for each pipe installation and summarize them. On the basis of the construction drawing, in order to better combine with the actual situation on site, the manufacturer should be organized to carry out field measurement to provide a more practical basis for material production. The height from the ground to the roof and the minimum allowable clearance height shall be determined when drawing detailed construction drawings. The maximum allowable diameter of the air duct is determined in consideration of personnel, equipment, etc. In order to maintain the uniform temperature from the wall to the wall and from the ground to the roof, the fabric air duct shall be close to the roof as much as possible, and the installation space shall be reserved at least from the roof to the top of the air duct for suspension installation.   
5. Conclusions and suggestions
The fabric air duct is made of special, permeable fiber materials, presenting a flexible pipe body; The installation effect is mostly tubular fiber tube, which is hung on the fixed wire rope or guide rail with hooks, and the appearance is novel and beautiful. The bag type air duct has more advantages than the traditional metal type air duct due to its special manufacturing materials, installation methods and air supply and exhaust effects. It has a wider application field and a more widespread application prospect. Fabric duct system has been used well in many projects, and I believe that this system will be more widely used.