Circular, Type G. 43" L. x 18" W. x 12" H. Improves basement insulation. Keeps out rain, snow, and debris. Durable impact-resistant plastic. 5 year warranty. Wall mount installation. No clips necessary. May be used with area wall Model No. RR3716-12 (SKU 101035), RR3716-18 (SKU 101044), RR3716-24 (SKU 101053), 75204-12 (SKU 100145), 75208-18 (SKU 100161), or 75210-24 (SKU 100439). No. W4218: Length: 43", Width: 18", Height: 12", Type: Circular, Type G, Material: Plastic