Kolbe announces the addition of Ultra EP (Energy Performance) casement windows to its Ultra Series product family of energy-efficient, aluminum-clad wood windows. The new Ultra EP windows feature triple pane glass and come standard with 1 3/8-in. insulating glass and LoE coatings designed to achieve U-factors as low as 0.19. Ultra EP wood windows’ exteriors are clad in durable aluminum. The aluminum is finished with a protective, fluoropolymer coating that carries up to a 30-year warranty, or with an optional, anodize that enhances the metallic appearance.