Air flow is what moves the stuff---All of it---the larger chips and shavings---the 1 micron stuff you cannot see.
Therefore do all that you can to keep runs short, turns gentle (eg. two 45 els to make a 90 degree turn), smooth insides in ducting whenever possible (It would be very difficult not to use some flex in a system. Keep it to a minimum) and be sure plenty of air can get into the system (If the input air is choked down the air speed, static pressure, etc. will all go to pot.).
For the last part, choking, think of the vacuum cleaner ads where the little vacuum cleaner holds up the bowling ball. Yeah, it holds up the ball but not one molecule of dust is going through the vacuum cleaner hose to the dust bag. The air has to move; anything you do to impede that air movement is reducing your efficiency, unless you want to hold up a bowling ball.
Last edited by Jim C Bradley; 12-07-2011 at 03:51 AM.
First of all you have to be smarter than the machine.