This high-performance shingle-over ridge vent is designed with an internal weather filter and external baffles and proves that outstanding beauty and performance can be combined. This product works year-round to ventilate the attic; Provides evenly distributed ventilation along the entire underside of the roof; Slim design for visual appeal; Provides a higher volume of airflow per square foot of attic area than any other fixed-vent system; Design maximizes airflow across the entire underside of roof sheathing; Changes in wind direction have no significant effect on vent performance. CertainTeed Ridge Vents combined with sufficient intake vents, such as CertainTeed Intake Vent, are the most efficient and effective systems you can install.