My object had some weird faces after adding a Subdivision Surface modifier

I can’t even select them:

The file (6MB):

HI, you need to select top and bottom polygons in edit and face select fill, you also need to add some edge loops supports on sides:

I think you also have duplicate faces.

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Thanks. Is there any good way to have a single face that doesn’t have any subdivision? Is it bad to do?

No, if you add the smooth modifier you need edge support.

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