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、加工材料不符合标准。

1、 The processed materials do not meet the standards.

1.表现形式：板面不均匀，厚度不均匀，有明显的压痕，裂缝，沙眼，疤痕和锈迹风管平面下沉，侧向突出，变形明显。

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：运行期间，漏风增加，空调负荷增加，风力和性能受到影响。

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，不能满足制作风管的需要。

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

4.措施：在使用风道处理设备制作风道之前，必须检查材料的质量证明和材料的外观厚度，以确保材料可用。

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、风管的角度和弯头的角度。

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

1.性能：矩形导管两个相对的平面，两端不平行角度不直对角线不相等咬不严。

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：会使风道连接不均匀，风道安装不直，法兰垫圈不紧，系统漏风，造成空调负荷损失，缩短使用寿命。

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：布局不准确两个平行的管道，与坯料的长度和宽度相反是不一样的。

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

4.尺寸：展开冲裁时，纸张应严格倾斜，并检查每张纸的长度，宽度和对角线，以便将其偏差控制在允许的范围内冲裁后，应通过在风道的另一侧重叠两个薄片来检查金属板的尺寸精度。

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.