Shoemaker 1600-12X20 12"x20" Floor Grille - Brown This product is designed to fit a 12" x 20" hole. Overall outside dimension is 14-3/8" x 22-3/8". Heavy-duty honeycomb construction; blades run parallel to longest dimension. Paint is a brown, driftwood tan finish. Flush core and frame provides smooth surface; Free area equals more than 75% of nominal size.