Suction unit for a central vacuum cleaner

FIG. 1 is a front elevational view of a suction unit for a central vacuum cleaner showing my new design, the rear view being plain and unadorned;

FIG. 2 is a top plan view thereof, the bottom wall being the same dimension as the top wall, but being plain and unadorned;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a top, left and front perspective view thereof.

The wall mounting bracket shown in broken lines in FIGS. 2-4, forms no part of the claimed design.