Before construction, it is necessary to carefully inspect whether the materials and equipment such as the suspension rods and fans are qualified, and operate strictly in accordance with the requirements of the specifications. At the same time, it is necessary to ensure that the support is firm and reliable to prevent safety accidents. For large-diameter air ducts, fire prevention measures also need to be considered. When welding, be careful to avoid welding slag splashing onto the surface of the painted pipe to prevent burns and damage to the paint surface. In addition, it is necessary to pay attention to timely clearing the garbage and debris in the work area to ensure that the construction site is clean and orderly.

2. Before manufacturing and processing, it is necessary to have a thorough understanding of the on-site working environment and carry out planning and design to reduce the trouble and unnecessary time waste caused by secondary handling. Moreover, after measurement and layout, it should be accurately positioned, firmly fixed, and transported to the final position under effective protection.

3. For large-diameter rectangular ventilation hoods (smoke exhaust valves) with variable diameter connections, the air outlets and regulating devices on the main pipes or branch pipes should be unfolded and laid flat at the angles required by the system, and gently tapped with a wooden hammer to ensure that all interfaces around them are uniform and tight. This is extremely important.

4. The surfaces in contact with different metals must be separated by corrosion-resistant gaskets that have undergone anti-oxidation treatment. At the joints of different elevations, the transition should be smooth and flat without air leakage. Galvanized iron wire or blind rivets should be used to stabilize the four sides on the keel and the flat base. Special attention should be paid to enhancing stability for parts with a side length less than 80mm or large air supply volume at the elbow.

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