Deflecto Wide Mouth Dryer Vent Hood with Removable Bird Guard, Damper, Weather-Resistant, 4 Inches Hood, White (HR4W) 4" (10.2cm) diameter opening Dryer vent hood is easy to install and vent closure is designed for maximum airflow Removable bird guard helps prevent birds and other pests from nesting in vent or entering home Durable and weather-resistant with UV inhibitor added to hood to prevent sun damage and cracking Check periodically and remove lint or other debris, if present