Ventilation Unit

FIG. 1 is an upper perspective view of an embodiment of a ventilation unit; FIG. 2 is a lower perspective view of the ventilation unit shown in FIG. 1 ; FIG. 3 is a bottom view of the ventilation unit shown in FIG. 1 ; FIG. 4 is a top view of the ventilation unit shown in FIG. 1 ; FIG. 5 is a left-side view of the ventilation unit shown in FIG. 1 ; FIG. 6 is a right-side view of the ventilation unit shown in FIG. 1 ; FIG. 7 is a rear view of the ventilation unit shown in FIG. 1 ; FIG. 8 is a front view of the ventilation unit shown in FIG. 1 ; FIG. 9 is an upper perspective view of a second embodiment of a ventilation unit; FIG. 10 is a lower perspective view of the ventilation unit shown in FIG. 9 ; FIG. 11 is a bottom view of the ventilation unit shown in FIG. 9 ; FIG. 12 is a top view of the ventilation unit shown in FIG. 9 ; FIG. 13 is a left-side view of the ventilation unit shown in FIG. 9 ; FIG. 14 is a right-side view of the ventilation unit shown in FIG. 9 ; FIG. 15 is a rear view of the ventilation unit shown in FIG. 9 ; FIG. 16 is a front view of the ventilation unit shown in FIG. 9 ; FIG. 17 is an upper perspective view of a third embodiment of a ventilation unit; FIG. 18 is a lower perspective view of the ventilation unit shown in FIG. 17 ; FIG. 19 is a bottom view of the ventilation unit shown in FIG. 17 ; FIG. 20 is a top view of the ventilation unit shown in FIG. 17 ; FIG. 21 is a left-side view of the ventilation unit shown in FIG. 17 ; FIG. 22 is a right-side view of the ventilation unit shown in FIG. 17 ; FIG. 23 is a rear view of the ventilation unit shown in FIG. 17 ; and, FIG. 24 is a front view of the ventilation unit shown in FIG. 17 . The broken lines shown in the figures are for illustrative purposes only and form no part of the claimed design. The dash-dot-dash lines in FIGS. 9 - 16 represent illumination of a portion of the ventilation unit.