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Ventilation ducts are metal or non-metallic ducts used for ventilation and air conditioning engineering in industrial and civil buildings. They are a type of municipal infrastructure that allows air flow and reduces the concentration of harmful gases. Most ventilation ducts are made from duct processing equipment. However, due to various reasons, it may cause problems in the manufactured air ducts.

一、加工材料不符合標準。

1、 The processed materials do not meet the standards.

1.表現形式：板面不均勻，厚度不均勻，有明顯的壓痕，裂縫，沙眼，疤痕和銹跡風管平面下沉，側向突出，變形明顯。

1. Manifestation: Uneven surface and thickness of the board, with obvious indentation, cracks, sand holes, scars, and rust marks. The air duct sinks flat, protrudes laterally, and deforms significantly.

2.效果：運行期間，漏風增加，空調負荷增加，風力和性能受到影響。

2. Effect: During operation, air leakage increases, air conditioning load increases, and wind power and performance are affected.

3.原因：材料不合格，不能滿足制作風管的需要。

3. Reason: The material is not qualified and cannot meet the needs of making air ducts.

4.措施：在使用風道處理設備制作風道之前，必須檢查材料的質量證明和材料的外觀厚度，以確保材料可用。

4. Measures: Before using air duct processing equipment to make air ducts, it is necessary to check the quality certificate and appearance thickness of the materials to ensure their availability.

二、風管的角度和彎頭的角度。

2、 The angle of the duct and the angle of the elbow.

1.性能：矩形導管兩個相對的平面，兩端不平行角度不直對角線不相等咬不嚴。

1. Performance: The rectangular conduit has two opposite planes, and the two ends are not parallel, the angle is not straight, the diagonal is not equal, and the bite is not tight.

2.效果：會使風道連接不均勻，風道安裝不直，法蘭墊圈不緊，系統漏風，造成空調負荷損失，縮短使用壽命。

2. Effect: It will cause uneven connection of the air duct, uneven installation of the air duct, loose flange washers, and system air leakage, resulting in loss of air conditioning load and shortened service life.

3.原因：布局不準確兩個平行的管道，與坯料的長度和寬度相反是不一樣的。

3. Reason: Inaccurate layout. Two parallel pipes are different from the length and width of the blank.

4.尺寸：展開沖裁時，紙張應嚴格傾斜，并檢查每張紙的長度，寬度和對角線，以便將其偏差控制在允許的范圍內沖裁后，應通過在風道的另一側重疊兩個薄片來檢查金屬板的尺寸精度。

4. Size: When unfolding punching, the paper should be strictly tilted and the length, width, and diagonal of each sheet of paper should be checked to control its deviation within the allowable range. After punching, the dimensional accuracy of the metal plate should be checked by overlapping two thin sheets on the other side of the air duct.