Shoemaker 1600-8X16 8"x16" Floor Grille - Brown This product is designed to fit a 8" x 16" hole. Overall outside dimension is 10-3/8" x 18-3/8". 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.