Air Vent FA109 is a stamped aluminum foundation vent with an adjustable sliding damper. It is designed to help protect your home from the damaging effects of moisture and pests by providing ventilation for your foundation. The FA109 is made of durable aluminum and features a built-in screen to keep out insects and debris. It is easy to install and can be used in a variety of applications, including new construction and renovations. The adjustable sliding damper allows you to control the amount of airflow, so you can customize the ventilation to meet your specific needs.