I have seen these guys up close, they are cleverly designed. They use what looks to be an airplane prop with 3 or 4 blades on it to cause an updraft convection. The cool thing was that the prop turned independently, of the high pressure bars. I was told that they have a few designs of these units and that they will be refining them. I was told that this system of vac is far superior to blower style lift, in that the props don't lose suction and have a great recovery ability if the do lose surface pressure.
They are made by NILFISK, but were origanly designed by another small company that NILFISK bought. I talked the guy last year or so who said that he used to own that smaller company, he offered to have me come to the factory to take a peek, but at 100k a peice, I need to pass, or at very least try to fabricate my own.
I
think that the biggest customer is Disney World, who may have purchased upwards of 15
units@$100k a shot.
The models that I saw were cleaning a much wider path then 24", they actualy seemed to be cleaning a path just a few inches short of the actual deck.
The "reclaim" portion of the units is kinda unique, in that they were not able to filter the water free of the oil, and the filtration was around 500 micron or so. But this may have changed.
Look on youtube for nilfisk or cyclone, for more info.
Origianly they were using a 60 horsepower John Deere power plant, but the website now list it as a 59 horse power Kubota. Does it make a difference? I dont know, except that the Kubotas are in more OEM products then the Deere's, but you know tomato' -- tomatoe whatever.