Interesting, I stumbled on this thread just now.
@Passinwind made a very relevant comment (#15 on page 1 of this thread) - these catalog attributes are often absent or incorrect, as they are either manually entered or automatically grepped.
Hence, when you specific a constraining height dimension and that attribute is absent for a specific part #, then that part won't show in the filtered results - even if it does actually satisfy the search filter requirements. So when the search fails, you can end up being forced to manually parse thru the exceptions. It's a drag. And, of course, as
@Big Monk surely knows all too well - another way around this quandary is to poll other forum folks, as he has done here.