The ornamental design for a coverunit for ceilingrails, as shown and described.
FIG. 1 is an enlarged fragmentary front elevational view of a cover unit
for ceiling rails showing my new design; and,
FIG. 2 is a cross-sectional view taken along line 2--2 of FIG. 1.
The pattern of the cover unit for ceiling rails is constant throughout its
length, and the broken lines showing ceiling panels and a support element
are for illustrative purposes only, and do not form a part of the claimed
design.