If you purchased the Tempered Glass version of the North case then your fan hub is not missing. It is not included in those versions of the case. The fan hubs are only included in the Mesh side panel versions of the case. As those versions of
Fractal North fan hub question : r/FractalDesign
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I think my case is missing the fan hub : r/FractalDesign
Fractal Design North Case with maxxed out air cooling : r/FractalDesign
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North Fan Hub Missing : Fractal Design Support