The 4 In. white plastic exhaust wall louvered vent is ideal for venting through the wall for new and replacement installations. This vent is used for clothes dryer exhaust, bath fan exhaust and other general venting applications. The exhaust vent allows for maximum exhaust airflow and prevents back drafts while the vent is not in use. The plastic vent has a UV additive to prevent premature fading due to the sun. Other models and colors available.