Modular Chair Unit

FIG. 1 is a perspective view of a modular chair unit according to a first embodiment of the design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the article shown in broken line form no part of the claimed design.