The appearance quality of the air duct shall be straight, the arc is average, the two ends are parallel, there is no warping angle, and the concave and convex surface is not more than 10 mm; the allowable deviation of the outer length of the air duct is 2 mm when it is less than or equal to 300 mm, and 3 mm when it is more than 300 mm. The allowable deviation of nozzle flatness is 2mm, and the difference of diagonal length shall not be greater than 3mm; the connection between air duct and flange shall be firm, the flanging shall be smooth, and the width shall be 6-9mm and close to the flange.

風管加工使用的金屬板材應符合下列規(guī)定：

The sheet metal used for air duct processing shall meet the following requirements:

1、普通鋼板的表面應平整光滑,厚度應均勻，不得有裂紋結疤等缺陷，其材質應符合現行標準的規(guī)定。

1. The surface of ordinary steel plate shall be flat and smooth, the thickness shall be uniform, and there shall be no crack, scar and other defects. Its material shall comply with the current national standards.

2、鍍鋅鋼板(帶)宜選用機械咬合類，鍍鋅層為100號以上的材料，其材質應符合現行標準的規(guī)定。

2. The galvanized steel sheet (strip) should be of mechanical bite type, and the galvanized layer should be more than 100, and its material should meet the current national standards.

山東通風管道加工

Shandong ventilation pipe processing

3、不銹鋼板應采用奧氏體不銹鋼材料，其表面不得有明顯的劃痕、刮傷、斑痕和凹穴等缺陷，風管加工材質應符合現行標準的規(guī)定。

3. The stainless steel plate shall be made of austenitic stainless steel, and its surface shall be free of obvious scratch, scratch, spot, dent and other defects. The material of air duct processing shall comply with the current national standards.

4、鋁板應采用純鋁板或防銹鋁合金板，其表面不得有明顯的劃痕、刮傷、斑痕和凹穴等缺陷，材質應符合現行標準的規(guī)定。

4. The aluminum plate shall be pure aluminum plate or antirust aluminum alloy plate, and its surface shall be free from obvious scratch, scratch, spot, cavity and other defects. The material shall comply with the current national standards.

(1)濟南風管加工應在建筑物圍護構造施工完成，以及場所清算完成后停止風管的裝置。

(1) Jinan air duct processing should be completed in the building envelope construction, and after the completion of the site clearing, stop the installation of air duct.

(2)裝置風管前，應對風管的位置，標高以及走向等停止復核，要契合設計請求，預留孔的位置應正確，孔洞的大小應大于風管外邊尺寸的100mm及以上。

(2) Before installing the air duct, the position, elevation and direction of the air duct shall be rechecked to meet the design requirements. The position of the reserved hole shall be correct, and the size of the hole shall be greater than 100 mm or more of the outer size of the air duct.

(3)風管搬運時應避免發(fā)作碰撞或摔打，以免損傷風管。裝置前應清算掉粉塵以及雜物，裝置過程中如有停頓，應封鎖風管口，以防有灰塵及異物進入風管。

(3) When handling the air duct, avoid collision or falling to avoid damaging the air duct. Dust and sundries shall be cleared before installation. If there is a pause in the process of installation, the air duct orifice shall be blocked to prevent dust and foreign matters from entering the air duct.