Yeah a shorter run is better, but thats a 3hp extractor, in total there is about 4-5 meters of hose its nothing to it. The next thing I may do is mount the motor above the cyclone and do away with the main body of the extractor and just fit a fine filter cartridge.
Do you find hanging the pipework from the cyclone like that makes it deform? Is it likely to break the glueline over time? Perhaps a more rigid fixing position would help and then run the pipework from there?
There's no real strain on the ducting, its flexible ducting it will stretch out to 20ft. I did a bit of destruction testing with the cyclones and I found like wood glue the plastic will break before the glue joint will.
I don't know what the filtration of my extractor is, 1 micron bags I think. But the cyclone itself separates the finer dust down into the bin. See how white the bags are from the extractor, thats my sort of measure of how little dust is making it though to the extractor itself that they have stayed clean.