Smoking issue with the Spandex SM fan series.

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~I would like to ask the experts: in spandex spinning production, a certain series is experiencing severe smoking. From which aspects should I start to investigate and resolve this issue? Currently, there are no abnormalities in the process; the air volume can be adjusted according to the process requirements, the negative pressure is normal, and the ABS values are also normal. However, even after adjusting the air volume, it drops again after a short while, resulting in instability. The middle Yong filter screen, from which some part numbers have been removed, is also clean. The lower elbow was also removed; the pressure difference in the main air duct has increased from 1.3 to 1.5 (at an opening degree of around 85). For other models, the pressure difference in the main air duct remains at 1.3 (with an opening degree of 89), and there is no drop in air flow volume nor any smoking. The problem has not been found yet.