Product review (4 stars): Great air cleaning, But damaged during shipping.
The unit arrived on time and was EZ to work with for install myself.  The unit had minor damage at top edge of unit, but this damage was less than first returned unit, so I kept it.  I am leaving town for a month and could not wait for another unit.  I would order from brick store on future items like this or make sure I have enough time for returns if needed.
The unit itself is very quiet and quickly clears air even on low speed, the high speed is loud, but really clears air.  The fan is different than old unit it replaced, in that the fan is on center like regular fan, not squirrel cages.  I will need to see how this design holds up in long use, I hope good.  The old unit was nearly 50 years old, I believe it was the original unit during build.