3/8 square opening as our previous order 286427. Matte black finish. Please make the outside dimensions of these grills 1 inch larger on all sides than the duct dimension.
14 - floor registers for a 6 inch by 12 inch duct Supply with damper NO holes
4 - return air wall grills for 12 inch by 12 inch duct return no damper with holes 1 in each corner
4 - supply air wall grills for a 10 inch wide by 8 inch tall duct supply with damper with holes 1 in each corner
2 - supply air wall grills for a 10 inch wide by 6 inch tall duct supply with damper with holes 1 in each corner
