Shoemaker 1600-12X24 12"x24" Floor Grille - Brown This product is designed to fit a 12" x 24" hole. Overall outside dimension is 14-3/8" x 26-3/8". 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.