OK, I have a 3 H.P. Leeson motor hooked to a 11" impeller which works decent for some machines. The machine trhat it does not work on is the molder/planer(25"). T he impeller has a straigth blade that is cast alum. Was thinking of trying a larger impeller maybe a 13"(14"x 3-1/2" clearance in housing) with curved fins. I know the motor can handle it, but not sure if I would gain enough suction or should I bite the bullet and get a larger system?