Deflecto Supurr-Vent Louvered Outdoor Dryer Vent Cover, 4 Inches Hood, White (HS4W/18) 4" (10.2cm) diameter vent opening; 6" x 6" total unit size Helps keep wind, rain and snow from entering outdoor dryer vents Dryer vent cover is easy to install and opens with ease for maximum exhaust flow Features curved louvers for quieter operation Durable and weather-resistant with UV inhibitor added to hood to prevent sun damage and cracking