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On a bypass machine all the suction is going to the nozzle through a 1 1/4" hose normally placed on the side of the cleaner this makes the vacuum not pick up well in the side opposite the intake hose and because the hose is small the hose also reduces the amount of air.  Think of it like this if you have a lot of dirt in a work bench and your using a shop vac you'll pick up more dirt in one pass if you use a tool with a wide opening, on a direct air vacuum there is a wide opening to the fan that helps to move more air.