Several years ago I tried to ask this question about how to make the best of the space in my PC for more case fans.

I thought I had put quite a lot of effort into researching for myself and then asking for factual information, not opinions (in fact I was researching the topic before I even thought about asking on a Stack Exchange site, and only asked because I had failed to find definitive information). But the question was very shortly closed as opinion-based. While I disagreed I didn't think it was worth anyone's time disputing that, so I left it and moved on.

However the question has accumulated a lot of views, despite it being closed the entire time, culminating in me getting notified that it had earned a Famous Question badge. I took this as evidence that the community is at least someone interested, and since I'm still interested and still don't see how it is classified as opinion-based, I edited it to try to be even more clear that I was seeking factual information and left a comment asking if it could be reopened.

Instead it was deleted.

No comments were ever left suggesting what was considered to be wrong with the question that I could improve, either at the time of the original close or when it was deleted.

I'm asking to review that decision and undelete & reopen the question, as I still think the original "opinion-based" closure is wrong. At it's heart this is an engineering question; there is an objective answer based on facts. If the only stack-exchange-sized answer is "the airflow depends on too many tiny factors for there to be simple guiding principles you can apply" then that's the answer I'm looking for (with a bit of explanation about why that is the case, of course). And I think the Famous Question badge shows that other people are also interested in similar answers, so it would be helpful to have them in the site's knowledge base.

But if the consensus of the community is that it is not a good question for this site, I will accept that. I would just like some better explanation why a question that looks to me to be firmly grounded in objective facts is considered too opinion-based, or why merely asking once for a review of that is grounds to delete it without responding.