Thank you for this info JTD! will check that out; as i wrote above, i certainly did miss that part and certainly others too, 4500 technical pages that's a lot
As for the compressor thing, it was more an image than something else, of course it can not be as powerfull as a true compressor, it's a fan.
Like a friend of mine says: sometimes you have to slightly exagerate to make the point and make the other understand your idea.