The constant, year-round movement of air across the attic is a process that can improve home comfort, reduce damage to the roof structure and help keep a roofing warranty valid. Every time stale, overheated air is vented out of the home, and fresh air is pulled in to replace it, you have an “air exchange.” The process of air exchange is more than a breeze moving through the home. It’s a process that provides a steady, high volume of air movement. It’s a system of components, all sized and positioned to create a balanced flow of intake and exhaust air moving though the attic