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Seal air fan is for avoiding foreign material entry in to the roller - by damaging the seals. The seal air fan flow is passing between the seal air ring and the cover, which is fixed one in rotating part and other in stationary part. Due to roller rotation centrifugal force, generally dust tends to enter in. But due to air flowing with pressure in between the ring and cover, dust will not enter in to the roller. In mill stop condition you may crosscheck it by starting the seal air fan and throw the dust on top of sealing ring area. If your seal ring gap is maintained properly, then the dust will be throwout.

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