Slowing down an electrical fan

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I have a floor standing fan with three speed settings ranging from f'ing fast to supersonic.  There a way I can slow the thing down to below standing on the runway next to a single prop about to take off without damaging its motor?

 

[chrisc]

 

[user 1995]

 

[Steerpike]

 

[mafioso]

 

[chrisc]

 

[d0dja]

 

[chrisc]

 

[Steerpike]

 

[XL1000]

 

[mafioso]

 

[CAD]

 

[mafioso]

 

[Jozua]

 

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[chrisc]

 

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[Jozua]

 

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