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

Circular, Type A 40" L

x 18-1/2" W

x 9-1/2" H

Backed with a 5 year warranty