SmartRidge I by DCI Products has a unique design and technology. The one-sided design eliminates the street-side shingle lift that most other double sided vents have. In addition to the aesthetic appeal, the ridge vent is 100 percent efficient. Because of the one-sided lift, the SmartRidge I creates negative air pressure, like a vacuum, which pulls only the hot, moist air out of the attic. For more information, visit www.dciproducts.com.