Re: Rexair/Rainbow Air Purification System:
That is what they actually call the Rexair/Rainbow Vac's. My Mother and I bought one that looks just like yours in 1994. They cost us around $1,500.00 new and my Mother even got the "Door-to-Door" Salesman and his Wife, to throw in the Shampoo Attachment as well.
I've just sold mine recently for $950.00 and it had never been out of the Boxes. I'm keeping my Mother's, since unfortunately the Salesman and Wife didn't get the Shampoo Attachment to us, before my Mother's Death. I helped her with cleaning the house, since she was getting quite Arthritic and since hers was getting use and mine wasn't, that is how I decided to sell mine and keep hers. It is quite a great Vac and when I bought mine, I also got the optional 4-Quart Water Tank, so it doesn't have to be emptied as often, depending on what your picking up with the Vac.
Good Luck with selling yours...
Peace and Happy Air Purifying and House Cleaning, Steve
SactoTeddyBear...