Rugged vent caps from can help you successfully terminate your building ventilation systems. Aluminum construction helps provide moisture and corrosion resistance. Galvanized steel construction can provide strength and durability. Help keep moisture, debris and small animals out of your vents with flat roof caps or wall caps with a built-in backdraft damper and bird screen. Whatever way you choose to terminate your building vents, trust Grainger to help you find the vent cap, roof cap or wall cap that'll help you get the job done right.