使用不锈钢管或使用铜管，管内流速都是紊流。
Using ga stainless steel tube or a copper tube, the flow rate in the tube is turbulent.
气流经过其内部流动直至排出，在排烟管内不易产生紊流，噪音小，油烟机不会产生大的震动。
Air passes through the inside of the range hood to be discharged, turbulent flow is not easy to generate in an exhaust pipe, noise is low, and the range hood only shocks slightly.
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