Formulated of a tough, durable, and thicker gauged polyester plastic. Fasten system bolts directly to the area wall with a slide bolt assembly, making ventilation possible. Improves basement insulation. Keeps out snow, rain, and debris. Comes with brackets. Elongated, 40" L. x 14-1/2" W. x 9-1/2" H., may be used with area wall Model No. SS3712-12 (SKU 101008), SS3712-18 (SKU 101017), or SS3712-24 (SKU 101026). Backed with a 5 year warranty.