A 21" fan is pretty small for the medium and great room sizes noted in the specifications for this item.  We loved the looks of this fan so we decided to try it anyway.  We replaced a much larger size fan in a medium sized room with a lofted ceiling and were pleasantly surprised at how much air it actually moved - I still would not put it in a great room alone, but two units would probably do the job.  The only "issue" is the included LED bulbs did not like the dimmer we used (it was LED rated) and they flickered. We replaced them with some box store FEIT Electric LEDs and everything looks and works great. Oh, this fan is quiet, really quiet.