Whether the joint connection of ventilation pipe is successful or not is the key to the successful installation of the whole ventilation pipe system. If the joint connection of ventilation pipe is not qualified, it will cause the leakage of the pipe system in the process of use. Therefore, when the joint connection of ventilation pipe is carried out, we must pay attention to the following precautions.

1、矩形风管直管段，不管是同一板材连接，还是几块板材组合拼接，表面需平整、角线顺直。组合前应板材切口表面的切割粉末、灰尘及杂物。

1. Whether the straight section of rectangular duct is connected by the same plate or assembled by several plates, the surface shall be smooth and the corner line shall be straight. Before combination, the cutting powder, dust and sundries on the cutting surface of the plate shall be removed.

2、管段组合后45度角切边外部接缝，需贴铝箔胶带封合板材外壳面，每边宽度不少于20mm.用角尺、钢卷尺检查调整垂直度及对角线偏差，并符合规范要求。

2. After the pipe section is assembled, the outer joint of 45 degree angle trimming shall be sealed with aluminum foil tape, and the width of each side shall not be less than 20 mm. The perpendicularity and diagonal deviation shall be checked and adjusted with angle ruler and steel tape, and shall meet the specification requirements.

3、风管的圆弧面或折线面完成下料并折压成型后，应与平面板预组合无误后在涂刷粘合剂，以保证管件的几何形状尺寸及观感。

3. After the arc surface or broken line surface of the air duct is cut and folded, it should be pre assembled with the plane plate and then coated with adhesive to ensure the geometric size and appearance of the pipe.

4、连接组合后的管段应垂直摆放定型后方可移动。

4. After connecting and assembling, the pipe section shall be placed vertically until it is shaped before moving.

5、铝箔复合保温风管所用粘合剂须按板材厂商认定的专用粘合剂，如另行采购粘合剂，必须做连接效果对比试验，并经监理、板材商检查、认可后方可使用。

5. The adhesive used for the aluminum foil composite insulation duct shall be the special adhesive recognized by the sheet manufacturer. If the brand adhesive is purchased separately, the connection effect comparison test must be conducted, and it can only be used after being inspected and approved by the supervisor and the sheet manufacturer.

6、粘结前须预组合，检查接缝全部贴合无误再涂刷粘合剂，粘合时间控制与季节、温度及粘合剂性能有关。批量加工前应作样板试验，确定粘合时间。

6. Before bonding, it is necessary to pre assemble, check that all joints fit correctly, and then brush the adhesive. The bonding time control is related to season, temperature and adhesive performance. Sample test should be done before batch processing to determine the bonding time.