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　　Noise and quietness in stainless steel ventilation pipe will affect the inner lining of sound absorption pipe. The decibel of attenuation is the measurement of various shapes and sizes of lined and unlined rectangular pipes per foot of pipe length, as well as various frequencies of ventilation pipes in Shandong Province.

　　衰減與吸收系數有關，吸收系數與管道截面尺寸有關，研究發現，山東通風管道的襯砌與Sivian的理論公式更接近，而不是其他任何已經提出的公式。該測量還通過連接到系統的5000cfm容量風扇的噪聲進行。人們發現噪音是由摩擦產生的。

　　The attenuation is related to the absorption coefficient, which is related to the pipe section size. It is found that the lining of Shandong ventilation pipe is closest to sivian's theoretical formula, rather than any other formula that has been put forward. The measurement is also carried out by noise from a 5000 CFM capacity fan connected to the system. It is found that noise is caused by friction.

　　在高達每分鐘1500英尺的速度下，無論是有內襯還是沒有內襯的空氣，與管道內壁的空氣相比都是微不足道的，噪音是由風扇葉片產生的。在流動系統中引入了一種特殊的擋板結構來測量靜度和空氣阻力的影響。吸收劑襯里管的摩擦阻力與未襯里管的摩擦阻力測量方法相同。

　　At speeds of up to 1500 feet per minute, air with or without lining is negligible compared to the air inside the pipe, and the noise is generated by the fan blades. A special baffle structure is introduced into the flow system to measure the influence of static and air resistance. The friction resistance of the absorber lined pipe is the same as that of the unlined pipe.

　　當通風道與外風道并列時，可采用輪式換熱器。輪子的一半在一根管子里，一半在另一根管子里。

　　When the ventilation channel is parallel with the external air channel, the wheel type heat exchanger can be used. Half of the wheel is in one pipe, half in the other.

　　當山東風管輪轉動時，加熱爐管中的車輪部分對穿孔車輪結構進行加熱。位于冷卻管中的車輪部分從穿孔的車輪結構中去除熱量。輪子也可以用干燥劑處理，這樣水也可以從一條小溪轉移到另一條小溪。

　　When the Shandong air duct wheel rotates, the wheel part of the heating furnace pipe heats the perforated wheel structure. The part of the wheel in the cooling pipe removes heat from the perforated wheel structure. Wheels can also be treated with desiccant so that water can also be transferred from one stream to another.

　　車輪沒有完全密封，車輪本身的體積從一個管道泄漏到另一個。因此，需要在流之間零轉移(交叉污染)的應用程序不能使用輪子。車輪需要并排和同樣大小的管道，限制了許多應用程序所需的包裝自由度。但并非更不重要的是，輪子是帶有馬達、傳動帶、滑輪、軸承等的主動移動機器，需要高技能的維修人員來保持輪子轉動。

　　The wheels are not completely sealed and the volume of the wheels themselves leaks from one pipe to another. Therefore, applications that require zero transfer (cross contamination) between flows cannot use wheels. Wheels need to be side-by-side and the same size of pipe, limiting the freedom of packaging required by many applications. Last but not least, the wheel is an active moving machine with motor, drive belt, pulley, bearing, etc. it requires highly skilled maintenance personnel to keep the wheel rotating.