Without an actual study, logic would dictate a downdraft table based on gravity. More vacuum power would be required to lift the sawdust than to just let it drop into a confined/contained area and suck it from there.
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B
Last edited by Tony B; 04-27-2020 at 03:17 PM.