形镀锌风管是当前中央空调、公共建筑通风系统中应用很广的类型，特点是易适配建筑空间、节省吊装面积，规格以“长×宽”（单位：mm）标注，遵循50mm或100mm的模数设计，常见标准组合包括400×200、500×200、500×250、600×300、800×400、1000×500、1200×600、1500×800、1800×1000、2000×1200，部分大型厂房主通风管会用到2500×1500的超大截面。矩形风管厚度按边长划分：边长≤500mm时用0.5-0.75mm厚；500mm＜边长≤1500mm时用0.75-1.2mm厚；边长＞1500mm时需1.2-2.0mm厚，防止大截面管道下垂变形。
Galvanized duct is a widely used type in current central air conditioning and public building ventilation systems. Its characteristics are easy to adapt to building space, save lifting area, and its specifications are marked with "length x width" (unit: mm), following a module design of 50mm or 100mm. Common standard combinations include 400 × 200, 500 × 200, 500 × 250, 600 × 300, 800 × 400, 1000 × 500, 1200 × 600, 1500 × 800, 1800 × 1000, 2000 × 1200. Some large factory main ventilation ducts may use a super large section of 2500 × 1500. The thickness of rectangular air ducts is divided by side length: when the side length is ≤ 500mm, 0.5-0.75mm thickness is used; When 500mm ＜ side length ≤ 1500mm, use 0.75-1.2mm thickness; When the side length is greater than 1500mm, a thickness of 1.2-2.0mm is required to prevent sagging and deformation of large section pipelines.


镀锌螺旋风管是采用连续咬口工艺制成的圆形风管，咬口密封性好、加工效率高，多用于除尘系统、环保排气、中低压通风场景，常见直径序列与普通圆形风管基本重合，厚度选择更侧重标准化：小直径（≤500mm）多用0.5mm厚，中直径（500-1200mm）用0.75-1.0mm厚，大直径（＞1200mm）用1.2mm厚，整体厚度略薄于普通圆形风管。
Galvanized spiral air duct is a circular air duct made by continuous biting process, with good biting sealing and high processing efficiency. It is mostly used in dust removal systems, environmental exhaust, and medium and low pressure ventilation scenarios. The common diameter sequence basically overlaps with ordinary circular air ducts, and the thickness selection focuses more on standardization: small diameter (≤ 500mm) is mostly 0.5mm thick, medium diameter (500-1200mm) is 0.75-1.0mm thick, and large diameter (>1200mm) is 1.2mm thick. The overall thickness is slightly thinner than ordinary circular air ducts.


除通用规格外，不同场景还有特定要求：消防排烟风管需满足耐火极限，厚度比普通风管厚0.2-0.3mm，常见规格为600×400、800×500或直径1000mm以上；厨房排油烟风管因含油脂、风量大，常用800×600、1000×800矩形或直径1200-1600mm圆形；中央空调送风支管多采用小尺寸矩形
In addition to the general specifications, there are specific requirements for different scenarios: fire exhaust ducts need to meet the fire resistance limit, with a thickness of 0.2-0.3mm thicker than ordinary ducts, and common specifications are 600 × 400, 800 × 500, or a diameter of 1000mm or more; Due to the presence of grease and high air volume, kitchen exhaust ducts are commonly used in rectangular shapes of 800 × 600, 1000 × 800, or circular shapes with diameters of 1200-1600mm; Central air conditioning supply branch pipes often use small-sized rectangular shapes