to the flexible blower tube 22 or forward sideways as directed by the vertical deflector plates 30 the air deflector box 20 includes vertical deflector plates 30 that guide air flow forward and sideways of the mobile ground leaf blower 10 when large areas are to be cleared of leaves or other debris fig4 a shows the air deflector box 20 with the horizontal deflector plate handle 36 in the down position fig4 b c show the air deflector box 20 with the horizontal deflector plate handle 36 in the up position fig4 d shows the interior of air deflector box 20 when the horizontal deflector plate handle 36 is in the up position although the horizontal deflector plate handle 36 itself is not visible in fig4 d this figure shows the positioning of the horizontal deflector plate 28 in the interior of the air deflector box 20 when the horizontal deflector plate handle 36 is in the up position turning to fig5 a d the air deflector box 20 is illustrated with the horizontal deflector plate handle 36 in the up position such that the horizontal deflector plate 28 is in the down position as best seen in fig5 c and 5d in this position as indicated by the arrows in fig5 a the air flow from the blower unit 16 is deflected by the horizontal deflector plate 28 so as to flow into the flexible blower tube 22 at that time no air or only minimal air is.