I have 3 such units in my house (hydronic), all by Embassy Industries. I would not recommend these units as the bushings fail and when they go, the fan makes a heck of a racket. Each of my units have had the bushings replaced in the 10 years I've owned them (first failed after 5 years, the last this past winter).
On the positive side; when the bushings are fresh they are nice a quiet. Each time I've called Embassy for replacement bushings they have been good about sending replacement bushings free of charge (more then likely because they know they just don't last).