Globe Building Materials Inc., Whiting, Ind., offers the SmartAir Vent System, which uses a roof’s natural shape to ventilate the entire underside of the roof. First, cooler outside air comes into the attic through intake vents at the eaves. Then, warm moisture-laden air rises up to the ridge vents. Warm air and unwanted moisture leave the attic through the ridge vents, allowing the underside of the roof to remain cool.