I finally decided to take the plunge and get a unit to clean the air in the shop, in addition to my Dust Collector. Since Steel City has a nice unit on sale, I decided to go for it.
When the unit arrived all looked good. Unpacked the unit and read the instructions. Removed the packing foam and started to install the hanging eye bolts. Someone had gotten a little carried away in putting the screws into the eye bolt holes (why screws you have to remove to install the eye bolt? Probably to seal the unit if you do not used the bolts.) One of the fittings came lose in the unit, but the eye bolt would still install and snug down with the locking nut (pinch fashion). The instructions said to mount it at least seven feet above the floor and since it weights about 55 pounds, I hooked up the coffin hoist and attached it to the eyebolts. The mountings for two of the four eye bolts bent in the sheet metal, but did not come out. But while I had it hanging, and before I got it in the final location, I hit the power button. The squirrel cage was jammed against the housing. I checked the motor mount and it had been hit hard enough to bend it, though the box did not show any impact damage. I gently straightened the motor mount and hit the switch. The squirrel cage spun free but had a rather severe vibration.
At this point, I called the folks I bought it from and (this is the good part of the story) got a treatment you would not believe.
Woodworker's Supply not only changed out the unit but sent a pick up via UPS and will send the replacement unit as soon as it is in stock, probably tomorrow.
Bottom line, the unit is probably good, but very fragile (case is made of much too thin a gauge metal). DO NOT hoist it by the eye bolts. As far as mounting it by them once you get it lifted up to the mounting point, don't know, haven't gotten that far. I do know that when the replacement arrives, I will bench test it and IF it passes I will gently lift it into position and let it sit on a couple of 1x6's. The eye bolts will stay in the bag.