The Imperial Steel Return Air Sidewall Grille For Cooling/Heating Systems, White, 30 x 6-in, helps ensure your cooling and heating systems perform efficiently. Crafted from sturdy steel and powder-coated white for a sleek look, this grille allows air to easily circulate from your room into your vents. The closely spaced 1/3-inch fins prevent dust buildup while allowing an even flow of air to maximize comfort. Its straightforward, architectural design adds subtle style to any wall space without drawing too much attention. The sidewall grille features a 30-inch opening length, 6-inch opening width, 1/3 inch fins spacing, steel, white, power-coated, 31-1/4 inch in length, 7-1/4 inch width, and 1/4 inch thickness.