Efficiently seal vents in closed crawlspaces with VentBlock (pictured) and VentBlock+. The polyethylene panels provide a fast, clean and effective way to seal foundation vents when providing crawlspace moisture control. The “plus” version features a screen backing to restrict rodent entry. Install by press-fitting the VentBlock to the interior side of the existing foundation vent. Available individually or in cases of 30, the units fit a standard 8×16-inch foundation vent opening, and can be trimmed to fit a smaller size if needed. An optional edge seal is available for a tighter seal and wind protection.