A nozzle assembly for a sieve box, comprising: a support assembly configured to be mounted in a sieve box; and a nozzle operatively connected to the support assembly; wherein the support assembly is configured to allow at least one of lateral movement and rotational movement of the nozzle relative to the sieve box; wherein the support assembly comprises: a first elongated support member; a second elongated support member that is substantially parallel to and in fixed spatial relation with the first elongated support member, a first support collar defining an opening through which the first elongated support member is received; a second support collar defining an opening through which the second elongated support member is received; a plate member to which the first support collar, the second support collar, and the nozzle are mounted; wherein the nozzle is operatively connected to the first support collar and the second support collar, wherein the support collars (51, 57) and elongated support members (52, 59) are configured to provide both of lateral movement and rotational movement of the nozzle relative to the support collars (51, 57) and elongated support members (52, 59); wherein the second elongated support member is pivotable about the first elongated support member so as to adjust the angles at which the plate member and the nozzle are disposed. a support assembly configured to be mounted in a sieve box; and a nozzle operatively connected to the support assembly; wherein the support assembly is configured to allow at least one of lateral movement and rotational movement of the nozzle relative to the sieve box; wherein the support assembly comprises: a first elongated support member; a second elongated support member that is substantially parallel to and in fixed spatial relation with the first elongated support member, a first support collar defining an opening through which the first elongated support member is received; a second support collar defining an opening through which the second elongated support member is received; a plate member to which the first support collar, the second support collar, and the nozzle are mounted; wherein the nozzle is operatively connected to the first support collar and the second support collar, wherein the support collars (51, 57) and elongated support members (52, 59) are configured to provide both of lateral movement and rotational movement of the nozzle relative to the support collars (51, 57) and elongated support members (52, 59); wherein the second elongated support member is pivotable about the first elongated support member so as to adjust the angles at which the plate member and the nozzle are disposed. a first elongated support member; a second elongated support member that is substantially parallel to and in fixed spatial relation with the first elongated support member, a first support collar defining an opening through which the first elongated support member is received; a second support collar defining an opening through which the second elongated support member is received; a plate member to which the first support collar, the second support collar, and the nozzle are mounted; wherein the nozzle is operatively connected to the first support collar and the second support collar, wherein the support collars (51, 57) and elongated support members (52, 59) are configured to provide both of lateral movement and rotational movement of the nozzle relative to the support collars (51, 57) and elongated support members (52, 59); wherein the second elongated support member is pivotable about the first elongated support member so as to adjust the angles at which the plate member and the nozzle are disposed.