Is it perfect?  No it wobbles on low.  Does it suck the crap out of the air. Oh hell yea it does!  On high its hold your hat boys.  Its suck the crap out and watch the dirt fly. We made a 2x6 extension to go around it and put a nice charcoal filter to go over it.  It filters bad air when we use bad stuff and we use a regular filter when we want to suck out dust and cwap, Yes cwap.  That way the fan itself will last longer. The wobble doesn't hurt a thing and you cant hear it.  So no worries mate.!  Geat purchase.