US D446298 S1
FIG. 1 is a top view of a duct showing my new ornamental design.
FIG. 2 is a side view thereof.
FIG. 3 is a perspective view thereof.
FIG. 4 is a back view thereof; and,
FIG. 5 is an enlarged cross sectional view taken on line 5—5 of FIG. 2.