Designed with internal weather filter and external baffles, CertainTeed Ridge Vent filtered proves that outstanding beauty and performance can be combined. Less than an inch in height, this molded, high-impact copolymer shingle-over ridge vent permits capping of the ridge with shingles like the rest of the roof. CertainTeed Ridge Vents combined with sufficient intake vents, such as CertainTeed Intake Vent, are the most efficient and effective systems you can install. Available with and without nails. Works year-round to ventilate the attic. Provides evenly distributed ventilation along the entire underside of the roof. Slim design for visual appeal. Changes in wind direction have no significant effect on vent performance. 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.