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　　測量管道的實際尺寸

　　Measure the actual size of the pipeline

　　1.管道測量

　　1. Pipeline measurement

　　對于圓形通風管道，使用卷尺或游標卡尺測量其內徑或外徑。測量內徑時，將卡尺的卡爪伸入管道內部，測量相對兩點之間的距離；測量外徑則直接在管道外側進行測量。若管道較長，可在多個位置進行測量，取平均值，以確保測量結果的準確性。通過準確測量得到的尺寸數據，與標注規格進行對比，判斷管道是否符合要求。

　　For circular ventilation ducts, use a tape measure or vernier caliper to measure their inner or outer diameter. When measuring the inner diameter, insert the jaws of the caliper into the interior of the pipeline and measure the distance between two relative points; Measure the outer diameter directly on the outside of the pipeline. If the pipeline is long, measurements can be taken at multiple locations and the average value can be taken to ensure the accuracy of the measurement results. Compare the dimensional data obtained through precise measurement with the labeled specifications to determine whether the pipeline meets the requirements. 

　　2.管道測量

　　2. Pipeline measurement

　　測量矩形通風管道時，分別測量其長、寬和壁厚。長和寬的測量較為簡單，用卷尺沿著管道的邊緣測量即可；壁厚測量則需要借助游標卡尺，在管道的邊緣處選取多個點進行測量，因為管道壁厚可能存在一定的誤差，多點測量能更準確地反映其實際壁厚情況。將測量結果與標注信息核對，從而區分不同規格的矩形通風管道。

　　When measuring rectangular ventilation ducts, measure their length, width, and wall thickness separately. The measurement of length and width is relatively simple, just use a tape measure to measure along the edge of the pipeline; Wall thickness measurement requires the use of a vernier caliper to select multiple points at the edge of the pipeline for measurement, as there may be some errors in the pipeline wall thickness. Multi point measurement can more accurately reflect its actual wall thickness situation. Compare the measurement results with the labeled information to distinguish rectangular ventilation ducts of different specifications.

　　辨別管道的材質特性

　　Identify the material characteristics of pipelines

　　1.材質管道

　　1. Material pipeline

　　鍍鋅鋼板管道：表面有明顯的鍍鋅層，呈現銀白色金屬光澤，且帶有規則的鋅花圖案。用手觸摸表面光滑平整，硬度適中，敲擊時會發出清脆的金屬聲。鍍鋅鋼板管道耐腐蝕性較好，常用于一般的通風換氣系統，如建筑的新風系統、空調送風管道等。

　　Galvanized steel pipe: The surface has a clear galvanized layer, presenting a silver white metallic luster, and has a regular zinc flower pattern. The surface is smooth and flat when touched by hand, with moderate hardness, and a crisp metallic sound will be emitted when struck. Galvanized steel sheet pipes have good corrosion resistance and are commonly used in general ventilation systems, such as building fresh air systems, air conditioning supply ducts, etc. 

　　不銹鋼管道：外觀光亮，顏色比鍍鋅鋼板更白亮，表面無鋅花。不銹鋼管道硬度高，耐腐蝕性出眾，尤其適用于潮濕、有腐蝕性氣體的環境，如廚房油煙排放管道、化工車間的通風管道等。通過觀察顏色、觸感以及硬度等特性，可區分鍍鋅鋼板和不銹鋼材質的通風管道。

　　Stainless steel pipeline: The appearance is bright, the color is whiter and brighter than galvanized steel plate, and there is no zinc flower on the surface. Stainless steel pipes have high hardness and strong corrosion resistance, especially suitable for humid and corrosive gas environments, such as kitchen fume exhaust pipes and ventilation pipes in chemical workshops. By observing the characteristics of color, texture, and hardness, it is possible to distinguish between galvanized steel sheet and stainless steel material ventilation ducts. 

　　2.屬材質管道

　　2. Belonging to material pipeline

　　PVC 塑料管道：顏色多樣，常見白色、灰色等，質地較輕，柔韌性較好。用手按壓管道表面，會有一定的彈性變形，松開后能恢復原狀。PVC 管道耐酸堿腐蝕，常用于衛生間排風、實驗室通風等對耐腐蝕性有要求的場所。

　　PVC plastic pipes: available in various colors, commonly white, gray, etc., with a light texture and good flexibility. Pressing the surface of the pipeline with your hand will cause some elastic deformation, but it can be restored to its original state after release. PVC pipes are resistant to acid and alkali corrosion and are commonly used in places where corrosion resistance is required, such as bathroom ventilation and laboratory ventilation. 

　　玻璃鋼管道：表面光滑，顏色豐富，常見黃色、綠色等。玻璃鋼管道強度高、重量輕，具有良好的耐腐蝕性和絕緣性，廣泛應用于化工、電力等行業的通風系統，以及地下通風管道等。可以根據材質的顏色、重量和物理特性，區分不同的非金屬通風管道。

　　Fiberglass pipeline: Smooth surface, rich colors, commonly yellow, green, etc. Fiberglass pipes have high strength, light weight, good corrosion resistance and insulation properties, and are widely used in ventilation systems in industries such as chemical and power, as well as underground ventilation ducts. Different non-metallic ventilation ducts can be distinguished based on their color, weight, and physical properties.

　　依據管道的功能用途區分

　　Differentiate based on the functional use of the pipeline

　　1.換氣管道

　　1. Ventilation pipeline

　　用于一般通風換氣的管道，如建筑的室內通風系統，通常對管道的密封性、通風量有要求，規格大小根據建筑物的面積、使用人數等因素確定。這類管道尺寸較為規整，材質多為鍍鋅鋼板或 PVC 塑料，安裝時注重管道的連接密封性，以保證良好的通風效果。

　　The ducts used for general ventilation, such as indoor ventilation systems in buildings, usually have requirements for the sealing and ventilation volume of the ducts. The size of the ducts is determined based on factors such as the area of the building and the number of users. These types of pipelines have relatively regular sizes and are mostly made of galvanized steel plates or PVC plastic. When installing, attention should be paid to the connection and sealing of the pipelines to ensure good ventilation. 

　　2.送風管道

　　2. Air supply duct

　　空調送風管道除了要滿足通風要求外，還需考慮保溫性能，防止在輸送冷空氣或熱空氣時出現能量損耗。因此，管道外部通常會包裹保溫材料，如橡塑保溫棉、玻璃棉等。管道的規格根據空調系統的制冷（熱）量、送風距離等確定，與普通通風換氣管道在外觀和功能上有明顯區別。

　　In addition to meeting ventilation requirements, air conditioning supply ducts also need to consider insulation performance to prevent energy loss when transporting cold or hot air. Therefore, insulation materials such as rubber insulation cotton, glass wool, etc. are usually wrapped around the outside of the pipeline. The specifications of the pipeline are determined based on the cooling (heating) capacity and air supply distance of the air conditioning system, and there are significant differences in appearance and function compared to ordinary ventilation ducts. 

　　3.排氣管道

　　3. Exhaust pipe

　　工業排氣管道用于排放工業生產過程中產生的廢氣、粉塵等污染物，對管道的耐磨性、耐高溫性和耐腐蝕性要求較高。根據不同的工業生產需求，會選用不同材質和規格的管道，如高溫煙氣排放可能采用不銹鋼或陶瓷內襯的管道；排放含有粉塵的廢氣，可能會選擇內壁光滑、耐磨性好的管道，并配備相應的除塵設備接口。通過了解管道的使用場景和功能需求，能有效區分不同規格的工業排氣管道。

　　Industrial exhaust pipes are used to discharge pollutants such as exhaust gas and dust generated during industrial production processes, and require high wear resistance, high temperature resistance, and corrosion resistance of the pipes. According to different industrial production needs, pipes of different materials and specifications may be selected. For example, pipes with stainless steel or ceramic lining may be used for high-temperature flue gas emissions; When discharging exhaust gases containing dust, it is possible to choose pipelines with smooth inner walls and good wear resistance, and equip them with corresponding dust removal equipment interfaces. By understanding the usage scenarios and functional requirements of pipelines, it is possible to effectively distinguish between industrial exhaust pipelines of different specifications.

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