CertainTeed's Filtered Rolled Ridge Vent's unique weather filter acts as a secondary level of defense. Independent research and testing have demonstrated that the best performing ridge vent, in terms of airflow and weather protection, is an externally baffled ridge vent. CertainTeed Ridge Vents combined with sufficient intake vents, such as CertainTeed Intake Vent, are the most efficient and effective systems you can install. Fast and easy installation - internal ribbing adds rigidity to make the vent nail gun friendly. Roll it out and nail it down. Prevents the premature deterioration of shingles and other roofing materials caused by inadequate ventilation.