Do you know the basic knowledge of ventilation ducts?

Fabric air duct ventilation duct manufacturers usually use the following calculation methods in the design of fabric air duct ventilation ducts, air ducts and piping components: 1. The installation of air ducts is calculated according to the 'area' of different specifications in the construction drawings, without deductions The area of u200bu200binspection holes, measuring holes, air inlet holes, suction holes, etc. When calculating the length of the pipeline, the length of the center line in the construction drawing shall prevail (the pipe and the branch pipe are divided according to the intersection of their center lines). It does not include the length occupied by canvas, dampers, mufflers and equipment. The outer diameter and circumference are expanded according to the dimensions shown. The loss is included in the fixed quotation, and the calculation result does not need to multiply the loss factor. 2. Sheet steel ventilation ducts, purification ventilation ducts, composite ducts (glass fiber board, non-combustible inorganic composite ducts), flanges, reinforced frames and hanging brackets are included in the quotation and do not need to be calculated separately. However, there is no air duct drop frame, so it is necessary to calculate the weight of the air duct drop frame according to the specifications in the figure. 3. The quotation quota for fabric air duct ventilation pipes, aluminum plate ventilation pipes, and air duct bite connections includes pipe fittings and flanges, but does not include hoisting brackets; the quotation quota for welded connections only includes pipe fittings, excluding flanges and hoisting brackets , and its engineering quantity is measured in kg, so the weight of the flange and the hoisting bracket is calculated according to the design instructions or the standard air duct connection method. (Refer to the settlement data of the construction project: the content of the flange (fabric duct angle iron 3#) is calculated as 0.9kg/m2; the content calculation of the hanging bracket (fabric air duct angle iron 4#, fabric air duct channel steel 6#): 1.5kg/m2; if other items are similar, please provide data correction in time;) 4. Air duct flexible wiring, (1) canvas wiring, calculated as 'square meter' according to the size shown in the figure, the general width is 250 mm, specific consideration , on-site production experience. (2) Hose air duct, calculated in 'meter' according to the drawing size. 5. For the guide vane of the air duct, the number of elbows is calculated according to the specification of the air duct, and the 'area' of the guide vane is calculated according to the table below. 6. The tuyere air valve, according to the different specifications of different types (fire dampers, butterfly valves, split multi-leaf valves, diffusers, louvers, etc.), takes 'pieces' as the unit of measurement (such as finished products). 7. The muffler, the muffler static pressure box and the static pressure box shall be measured in 'table' according to different specifications (calculated according to the finished product), except for the design requirements, the 'square meter' (expanded six-sided area) is not counted for on-site production. 8. Insect nets are calculated in 'pieces' or 'square meters9. Design description When there are inspection holes and air duct measuring holes for air ducts, the inspection holes should be converted according to the table below and calculated by weight. The model of inspection holes is measured in 'pieces'. 10. When the wall bushing is 2mm thick steel plate or other thickness (according to the design drawings), it should be calculated according to the 'area'.

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