Replacement automatic foundation ventilator - automatically opens at 70 deg. And closes at 40 deg. (Approximately). fits standard 8" x 16" vent openings. High-density thermo plastic construction with stainless steel metal parts. No electrical hook-up. Heavy-duty aluminum mesh screen - front and back. 65 sq. In. Net free area. 1 year warranty. - size: 16" x 8", type: automatic -retrofit, net free area: 65 sq. In, color: black, material: plastic W/stainless steel parts, pig Sty: 1, package type: box.