Ole, you are correct with your system numbers but the problem is that at over 8" SP the flow drops like a rock. Given the resistence of the cyclone, the filters as they fill given the surface area, the long runs with 270 to 360 degrees of bend, the flex at the end, you might be lucky to to stay at 8". If the real world ends up with SP of 10 or 11 you are dead in the water and have no plan B other than sell a used unit. Given that Todd has taken some hit already he might want to hook it up and measure the cfm but if it turns out all he can get is 500-750 he will have spent a lot for pretty crappy results. My experience with the cfm requiements of most machines is that they are low as well. almost all will benefit from 5000-6000 fpm. Dave