1. Post a picture of the entire fan, not just the label.

2. The RU (backwards R) is the underwriter's service mark for a
component.

....underwriters....Learn something new every day....

I checked Grainger and reliable parts but this motor is smaller than
the ones I saw.
It's closer to the size of an AC table fan motor. 120 volt CW 2500
rpm

http://s582.photobucket.com/albums/s...t=MVC-002F.jpg

Here's a group of photo bucket pic's of this thing (squirrel cage too)
maybe this will give you a better idea.
appreciate your taking a look.

Spark