What's wrong with the bite deviation of spiral duct machine

1. If the diameter of circular air duct (excluding spiral air duct) is greater than or equal to 80mm, and the length of its pipe section is greater than 1250mm or the total surface area is greater than 4 ㎡, reinforcement measures shall be taken;
2. Reinforcement measures shall be taken when the side length of rectangular air duct is greater than 630mm, the side length of thermal insulation air duct is greater than 800mm, the length of pipe section is greater than 1250mm, or the unilateral flat area of low-pressure air duct is greater than 1.2m2, and the medium and high-pressure air duct is greater than 1.0m2;
3. The reinforcement of irregular elliptical air duct shall refer to rectangular air duct.
The bolts, nuts, washers and rivets used for spiral air duct shall be matched with the performance of the pipe
The reinforcement of non-metallic air duct shall not only comply with the provisions of article 4.2.10 of this specification, but also comply with the following provisions: 1. When the diameter or side length of UPVC air duct is greater than 500mm, the connection between air duct and flange shall be provided with reinforcing plate, and the spacing shall not be greater than 450mm; 2. The reinforcement of organic and inorganic FRP air ducts shall be body materials or materials with the same anti-corrosion performance, and shall be integrated with the air duct.
Generally, inner and outer concentric arc bends with a radius of curvature of one plane side length shall be used for the manufacture of rectangular air duct bends. When other forms of bends are used and the plane side length is greater than 500mm, bend deflectors must be set.
The air duct of purified air conditioning system shall also meet the following requirements:
1. When the side length of rectangular air duct is less than or equal to 900mm, the bottom panel shall not have splicing joints; When it is greater than 900mm, there shall be no transverse joint;