[SOLVED] Is it ok to vacuum a case without anything inside?

[Penrose]

So I'm cleaning my pc and I took everything out of my case (metal btw), I was wondering If I could clean the dust with a vacuum cleaner, there is nothing in the case, I took everything out of it, so is it ok to do so?

 

[USAFRet]

Yes.
It's just a plastic and metal box.