ShingleVent II from Air Vent Inc., Dallas, is a filtered shingle-over ridge vent that provides 18 square inches of net free ventilation area per lineal foot. The vent has an external baffle system that deflects wind up and over the ridge, creating low pressure above the vent openings on both sides of the vent that literally lifts or pulls air evenly out of the attic. Available in black, brown, gray and charcoal to blend with shingle colors, ShingleVent rises only 7/8 inch off the rooftop for a streamlined appearance.