CertainTeed Intake Vent provides continuous intake airflow at the roof's edge and provides proper intake ventilation for homes with little or no overhang. It's a roof-top installed, shingle-over intake vent that can be used to supplement existing soffit or under-eave vents. Easily installs on the roof's edge; Roof-top installation eliminates overhead with soffits and under-eaves; Located tabs on the underside of the CertainTeed Intake Vent assist with positioning the vent over the slot; Co-polymer construction. CertainTeed Ridge Vent combined with sufficient intake vents, such as CertainTeed Intake Vent, are the most efficient and effective systems you can install.