Air Vent Manual Plastic Foundation Vents Carton of 12

Heavy-Duty Slider: Heavy-Duty Solid Plastic ConstructionNFA: 42 square inches. Aluminum Screen, Available in Black Vent Damper & Slider Vent: Heavy-Duty Solid Plastic Construction NFA: 42 square inches Aluminum Screen Slider available in Black only. Damper is available in Black only Jumbo Vents: 16 x 9 inches Damper NFA: 78 square inches Slider NFA: 60 square inches. Designed for use with Over-sized Blocks Available in Black Only Color: Black Ventilates your foundation/crawlspace Helps to remove moisture