[Por_sha911]

I used a small roll around one for a 400 sq foot basement den. The block walls were sealed, insulated and sheet-rocked. The room was connected to the central air system but we didn't a lot of flow down there. It worked fine. I put it away when we moved 18 years ago but then needed it to dry out an area from a water leak a couple years ago and it still worked fine! As I recall (it was years ago) I had to empty it every 2-3 days.

In my unqualified opinion, for a room like yours I would say you need something substantial in size and quality. Worst case scenario it won't run as much.