chosen several times wider than the width of subnozzles 1 also in these figures arrows 3 represent blowing flow arrows 5 represent suction flow and arrows 4 represent turning flow the lowest ends or tips of the subnozzles are inserted into deep bottom region of pile the turning flow 4 and sucked flow 5 created by the subnozzles in the carpet pile have nearly same high speed as the blowing flow 3 since the flow from 3 to 5 is almost one dimensional due to the longer front to back length of subnozzles in comparison with the left to right width therefore the flow 4 and 5 successfully remove dust embedded in pile each subnozzle has the shape shown in fig1 b and 1c the front width of the subnozzles is narrow and the front and back ends are sharpened like a ship bow and stern in order to lessen stroke resistance as shown in fig1 b and 1c for carpet without a loop pile structure a nose can be provided on the outer lowest portion of each of the front and back ends the nose helps the subnozzles to sink into carpet pile if the stroke resistance is still high a power assisted or power driven stroke will be included fig3 a 3 e and 4 show an actual embodiment of a suction head including subnozzles according to the present invention the suction head shown in fig3 a 3 e and 4 includes a pressurized room 17 prestage to the subnozzles the pressurized room 17 is elongated in a left right.