So just over year ago I set out to find a really good DC system. To all my searches everything Pointing back to the Bill Pentz system. I thought it would be a neat project to take on, everything from the building of the fan, fan housing, cyclone , and filtration box. Few of my hurdles were how to build efficient fan. I wanted something that had suction and worked as a blower. This is what I came up with. I wouldn't suggest most people building their own fan but, I thought I'd give it a try. I started out by building the hub assembly from aluminium of 6" deep by 2x2 .