The Supurr-Vent 4" Louvered Dryer Vent helps keep wind, rain and snow from entering outdoor dryer vents. The vent comes pre-assembled with Louvered Vent Hood, pipe and collar. Unit is asy to install and features curved louvers for quieter operation. This durable and weather-resistant outdoor vent cover features a UV inhibitor to help prevent sun damage and cracking.