US D341655 S
Abstract available in
FIG. 1 is a top plan view of an air duct riser which incorporates our new design;
FIG. 2 is a side elevation view of the air duct riser;
FIG. 3 is a front elevation view of the air duct riser; and,
FIG. 4 is a perspective view of the air duct riser.
The rear of the air duct riser is a mirror image of the front, and the bottom is a mirror image of the top.