Space-Saving Vertical-Opening Industrial Sectional Overhead Door For Narrow Urban Warehouses A Space-Saving Vertical-Opening Industrial Sectional Overhead Door is engineered for urban warehouses and distribution facilities where floor area and aisle width are limited. Instead of swinging or sliding outward, the door panels travel vertically along ceiling-mounted tracks, so the full opening remains clear and no ground-level operating space is lost. Why Vertical Opening Saves